Although for fans Simon Belmont started it all, for the longest time everyone assumed Trevor Belmont started the clan of vampire hunters. Credited as the originator of the clan until the release of Castlevania Legends, Trevor was the oldest known Belmont vampire hunter for much of the series run. Of course, later games then changed that, but even still, Trevor helped set the tone for the clan for years to come.
Plus, from a historical perspective, Trevor did help to establish one key detail: Dracula's resurrection every 100 years. His adventure occurred, in the timeline, 100 years before Christopher Belmont had to take up the whip, and with Christopher fighting Dracula 100 years before Simon had to, it established a legacy that was in effect for the rest of the series -- Dracula was coming back every 100 years, and while his minions could work to influence that, once Dracula was in the ground, set a timer because we all know the year he'll return.
Not that Trevor was all that different from Simon at first blush. Some magazines mistakenly reported Castlevania III as the third adventure for Simon (much like they had for The Castlevania Adventure) and it's easy to see why: built on a similar engine to the first games, the game features a hero that looks and moves like Simon. Without reading the instruction manual or watching the intro, you might never have a clue who the hero of the game really was. But hey, that just shows the Belmont genes are strong, right?
Of course once the series rebooted with the Lords of Shadow saga, Trevor's own history drastically changed. No longer the current Belmont to take up the whip once 100 years had passed (or, at least, the first to see that rule go into effect), Trevor was the son of new-series anti-hero, Gabriel Belmont. Trevor then follows his father down the rabbit hole, getting embraced and becoming Alucard, tying together two characters that had their own connected history in the older version of the timeline...
When Castlevania: Legends was released, it added a new progenitor for the clan: Sonia Belmont. Mother of Trevor, Sonia was the first to take up the whip, but she also hadn't had to time to learn all the powers the whip possessed (which is why she controls somewhat differently, with different special abilities, than later Belmonts). After she bested Dracula, though, she was chased out of Romania by villagers fearful of her power. Soon after, she gave birth to a child and passed on her powers, and the vampire hunting legacy, to her son.
What was controversial at the time, though, was that supposedly Trevor was the son of both Sonia and Alucard. Alucard shows up repeatedly in Legends, training Sonia so she'd be ready for her battle with Dracula. The implication, then is that there was a romance between the two and that, off-screen, the two got busy and produced a boy.
Of course, this was all mooted when Sonia was removed from continuity a few years later -- her spot in the timeline was removed, and the role of "first Belmont" was handed to Leon. Trevor, then, was just some guy descended from Leon who happened to inherit the whip centuries later. Nothing special there, and no implied ancestral connection to Dracula.
Castlevania III: Dracula's Curse
Of course, Dracula did come back (he always does) and the people of Romania were forced to call upon the only people that had proven at all capable of fending off the evil vampire lord and his minions: the Belmonts. Trevor, current heir to the whip, was called forth, and he ventured deep into Dracula's lands. Along the way, though, he too found help on his journey, three other heroes (Grant DaNasty, Sypha Belnades, and Alucard) that had been captured and imprisoned by Dracula, two of whom (Grant and Alucard) were forced to fight the Belmont when he showed up in their domains.
Trevor was able to free the heroes, and with their aid, explore ever deeper into Dracula's lands. Reaching the final castle, Trevor faced off with the foul demon, and though the battle was rough, Trevor emerged injured but victorious.
If Castlevania: Legends had been left in continuity, it would have added neat symmetry to the character dynamics here -- Alucard, son of Dracula, aids his own son, Trevor, in defeating his father. Three generations fighting an unending battle, which is pretty poetic in a way.
Now, one detail that we included but isn't in the original game is that Trevor gets injured by Dracula during the final battle (although anyone that has been able to play the game on a no-damage run may contest that). He ends up scarred, both across his back and on his face. In fact, in Castlevania: Judgment, Trevor wears an eyepatch over one side of his face, implying he lost his eye completely during the battle.
This actually puts the next two games in a weird position for the character's timeline -- although Judgment is said to occur for Trevor after Curse of Darkness, Trevor has both eyes (and no eyepatch) in Curse, leading to the question of what happened to the eye since that game? If the eye was still healing (if Judgment came first) the eyepatch might make sense, but as it stands, it's a weird detail that doesn't quite line up.
It's also worth noting that, officially, Trevor and Sypha Belnades get married, adding the Belnades magic into the clan (this will manifest, down the road, with Juste Belmont and his various powers).
To note, Castlevania III: Dracula's Curse did recieve one remake, a cellphone-only edition. From what we can find, the game was largely the same as the original, just modified to work on mobile devices.
Castlevania: Curse of Darkness
Three years after the events of Dracula's Curse the land still seems to be in peril. Despite Dracula's defeat, the dark magic has continued to pour out from his castle ruins. This spreading plague of darkness has been getting worse, causing the prosperous lands of Romania to fall back under Dracula's dark spell.
Searching the countryside, Trevor learned of a cult devoted to Dracula, worshipers of his power who had aided the dark lord in times past. Tracking through the countryside, Trevor confronted one of these cultists, Hector, only to realize after a brief battle that Hector wasn't working for Dracula but, instead, was on a similar path as the Belmont -- namely to find the one truly responsible for the terrible deeds that had so recently befell the land.
Searching separately, but in the end working together, Trevor and Hector made their way into the Abandoned Castle, only to be confronted by Issac, the Devil Forgemaster and leader of the dark cult. Trevor is left mortally wounded by the encounter but sends Hector ahead to take out Hector and stop Dracula's true resurrection from happening.
Thankfully Trevor is saved by Julia Laforeze, younger sister of Issac, who has been working behind the scenes to try and stop her brother and his insane plans.
Taking place sometime after the events of Curse of Darkness (supposedly), Trevor was drawn into a dimensional rift by a mystical traveler, Aeon. In the far future, Galamoth (evil villain and rival to Dracula) looked to defeat Dracula in the past and change history so that Galamonth came out on top. Sensing the kind of damage this could do to history (i.e., a lot), Aeon brought heroes and villains together in the rift in hopes that he could find one among them with the power and skill to stop Galamoth's plans... by pitting them against each other in combat (via a fighting tournament, naturally).
For his part, Trevor was all to happy to join in the combat -- unlike Simon (who in this game was depicted as conflicted over his family's power), Trevor was comfortable with the role he'd take on as a vampire hunter. Always up for a solid good-vs-evil fight, Trevor also viewed this is a good way to test his skill against his friends, Sonia Belnades and Alucard -- because what's friendship (and, by this time, marriage) if you can land a few blows on the ones you love?
(Of course, since it was a fighting game any one of the heroes, or villains, could have proved victorious -- the exact hero to end Galamoth's plans was never determined by Konami, so it's up in the air now if Trevor officially cast the fatal blow or not.)
Castlevania: Symphony of the Night
Officially, in Castlevania: Symphony of the Night, Alucard has to face off against three zombies in the Inverted Coliseum -- three zombies that look like his old friends (from Castlevania III): Trevor Belmont, Sypha Belnades, and Grant DaNasty. This is a nice nod to the previous title, but this isn't considered an official reappearance of Trevor (or the other two) since these are just zombie look a-likes.
Castlevania: Portrait of Ruin
Similarly, in Castlevania: Portrait of Ruin, the Zombie Trio make a second appearance, this time in the Nest of Evil. That area serves as a kind of "best of" for various Castlevania bosses from the Metroidvania era of the series. They don't serve any specific plot points here and, as before, these are just zombie look a-likes and not the real characters brought back to life.
Castlevania (Netflix Series)
Trevor is the main hero of the Netflix Castlevania series. A broken man, Trevor is haunted by events years before when the Church came after the Belmont family. Trevor is the last survivor of the clan, carrier of the sacred whip with the charge to save the world from demons and vampires. He turned his back on his legacy, though, figuring that humanity did little for him and his family so why should he care about what happens? Eventually, the Belmont is snapped out of his funk by Sypha Belnades and her clan of Speakers. He eventually teams up with the sorceress (as well as the half-vampire, Alucard) to take on both the evil of the Church and, then, the forces of Darkness lead by Dracula.
As depcited in the show, Trevor already has the scar over his eye (one of the modern flourishes Konami has made part of his design) but he sadly doesn't go around in a proper leather kilt (apparently leather skirts aren't appropriate vampire-hunter wear anymore). He is a master of combat, proving incredibly good at taking on multiple foes (when not drunk on ale), brandishing his whip (and eventually, the Belmont morningstar) with deadly accuracy. Although he doesn't act as heroic as we expect from our Belmont heroes, he certainly proves to be an effective hunter when needed.
Lords of Shadow History:
Castlevania: Lords of Shadow - Mirror of Fate
While the first Lords of Shadow game focused on new series lead (and start for the clan) Gabriel Belmont, the following two games fleshed out his descendents, showing Trevor and Simon Belmont at the heights of their own vampire hunting careers.
For Trevor, his story begins before the plot of the first game even kicks off. Concieved a yer before the events of Lords of Shadow, Trevor's birth was kept a secret from his father at the urging of the Brotherhood of Light (and order dedicated to wiping out the Lords of Shadow). This proved wise, saving the child, as Gabriel fell to darkness -- without this ruse, Trevor would have died along with his mother, Marie, when Gabriel (now going under the name "Dracula") returned from his quest against the Lords of Shadow.
Instead, Trevor was raised by the order to be a warrior. He also married a young woman, Sympha Belnades, and together that had a child, Simon. The Brotherhood, though, had plans for Trevor and, When the time was right, they revealed to the young vampire hunter his true lineage, explaining that is father killed his mother, and that the only way to clear the stain on his family's name would be to head to Bernhard Castle (now Dracula's Castle or, simply, Castlevania) to kill the demon lord living there.
Trevor, of course, took up the quest and headed off to the castle to face off with his vampiric father. The battle rage, but in the end Trevor was killed by Dracula. Before he died he revealed to his father who he really was: the son of the vampire lord. Bereft, Dracula tried to revive the boy by giving him some of his own blood, but it seemed too late -- the boy was dead. Dracula buried him under the name "Alucard" (since Trevor never revealed his real name).
Alucard, though, wasn't truly dead. Awakening 30 years later, the new vampire lord crawled from his grave to spy Dracula's castle still standing. Vowng to once again try to defeat his father, Alucard ventured into the castle only to encounter his own son, Simon, there as well. Simon had arrived on his own quest to defeat Dracula. Sensing the two might have been able to aid each other, Alucard assists the young Belmont, and together they face off against Dracula.
However despite seemingly defeating Dracula, Alucard notes that the vampire lord didn't die in the way a vampire normally does (Dracula dies in a splash of red light instead of, I dunno, imploding or turning to dust or crawling off screen and moaning for a few minutes -- yes, we just referenced Buffy the Vampire Slayer). Alucard, though, convinces the boy to give up the quest, and the two parted ways.
Castlevania: Lords of Shadow 2
Staying close over the years, the younger vampire lord was there when the Brotherhood was defeated by Dracula years later after a failed assault against the vampire master. It was then that Alucard approached his father and explained a plan he had devised to rid the land of evil and defeat Satan once and for all. With Dracula's agreement, Alucard plunged his sword into Dracula's chest, putting the vampire to sleep for ages until the time was right to resurrect him and finish off what Gabriel had started so many centuries ago.
Finally, but the time the future rolled around, over 500 yeas later, Satan and his disciple, Zobek were in a position to finalize their plans and take over/destroy/whatever the world. Alucard had, by this point, insinuated himself into Zobek's operation, working undercover as one of his lieutenants and personal bodyguard. Under cover of darkness, Alucard removed the shard of his sword from Dracula's chest, reviving the vampire lord.
While Dracula went about, regaining his power, visions of the young Alucard, a child-like Trevor, guided Dracula on a quest to collect the shards of the Mirror of Fate. This would, evntually, restore Dracula's memories of his plan with Alucard. He then teamed up with Alicard to defeat Zobek and take on Satan. Alucard, sadly, was taken over by the soul of Satan, and had to be nearly killed to be freed of the evil force. Dracula then defeated Satan, impaling him on the Vampire Killer.
Reviving his son with his blood one again, Dracula then ignores the part of the plan where he was supposed to die to restore Gabriel's final part of the ages old quest. Instead he, and Alucard, each go on living, leaving a chance for their darkness to potentially spill, once again, across the land.
Playing as Trevor:
In the main series, Trevor works a lot like Simon. He's a straight fighter, moving left and right, jumping, and attacking with his whip (which can upgrade twice) and sub-weapons. The unique twist of his classic game, Castlevania III, is that Trevor can switch out with one of the three heroes he collects along his journey. Each of these additional heroes have special abilities (Sypha has power magics, Grant the ability to climb walls and stick to the ceiling, and Alucard can turn into a bat and fly), giving the team greater mobility on their journey.
This extra movement through his partners is very useful since Trevor, like Simon, controls like a load of bricks. Trevor is unable to change directions in mid jump, nor can he jump onto or off of stairs (but then, to be fair, neither can his companions -- it just so happens that Grant and Alucard don't necessarily need to take the stairs). Over all, Trevor is one of the least manueverable Belmonts in the series.
This dynamic between the various team members was directly referenced in "Julius Mode" from the DS Castlevania, Dawn of Sorrow. In that unlockable mode, Julis Belmont has to go after Soma (who has turned to the "dark side" by embracing the Dracula soul within him) to defeat the evil power Soma is threatening to spread across the land. Julius, the Belmont of the game, is the Trevor analog in the mode, with Yoko Belnades filling in for Sypha and Alucard taking on the role of... Alucard. Sadly, there was no Grant analog -- audio clips hidden in the game seem to indicate Hammer, a shopkeep in the game, was to be playable, presumably as the Grant for the team up, but was most likely cut for time.
It is interesting to note that the Fake Trevor in the Zombie Trio controls much like real Trevor (when you're fighting him -- you don't actually get to play as Trevor). He has a verion of the whip as well as the holy cross (altough it's made of bones in this case, so kind of an "unholy cross"). Note that if Fake Trevor is killed before Fake Sypha, that Sypha will raise the dead man into a weaker zombified form.
As with Simon, Trevor receives a solid makeover in Castlevania: Judgment (well, okay, his moves got a good makeover -- his weird bondage costume left somthing to be desired). Most of Trevor's new moves were based around his whip -- in many ways, Trevor functions like an alternate costume for Simon. That said, he does play somewhat different -- he's physicall stronger but slower, meaning that you have to play him differently than you'd play Simon, taking less risks. Overall, though, Trevor is a solid charater once unlocked in the game.
Finally, a version of Trevor (both as Trevor and as Alucard) appeared in Castlevania: Lords of Shadow - Mirror of Fate and Lords of Shadow 2Mirror Trevor is a playable character. He has an improved version of the Combat Cross, his father's weapon, at his disposal. He's also able to use the various sub-weapons as well as tap into Light and Dark magic. He has access to different powers, including the vampiric kind, once he becomes Alucard and the player gets to try those out when playing as Alucard in the later parts of the game.
By Lords of Shadow 2, Alucard has gained new weapons and abilities to be an even more formidable foe. However, in his Trevor form he also appears, albeit at a young age than in Mirror. These visions of Trevor help to guide Dracula on his quest, ensuring the vampire lord doesn't stray from what must be done. Younger Trevor, though, is not a playable character in the games.