Trevor Belmont is first seen in the prologue of Castlevania: Curse of Darkness. He is fought as a boss twice. After he has beaten in the game at once, Trevor can be unlocked as a secret character by entering the name @TREVOR (@RALPH in Japanese version). His main theme is Belmont The Legend.
In the English version of the game, Trevor is voiced by Steve Staley.
First Meeting with Trevor (Hector walks into the room)
Trevor: Wait! That crest... Are you the devil forgemaster? Hector: That whip... Could he be...? Trevor: Answer me! Are you the devil forgemaster? Hector: I am. Trevor: Then this is the hour of your death!
"Are You Not Trevor Belmont?" (Both Hector and Trevor step away as the battle dies down. Hector falls to his knees then nearly hits the ground)
Trevor: On your oath, are you truly the devil forgemaster? Hector: And if I am? Trevor: For one that served under Dracula, you seem much too weak. It's been said that the devil forgemaster's power rivals that of Death. Hector: Ah, so you are hunting for Isaac, as well, I see... Trevor: As well? Then you're not... Wait... I recall there was another devil forgemaster. They say he betrayed Dracula and forswore his powers. But that was 3 years ago during the war... Could he have survived? It cannot be... Hector: Believe what you like. But answer me this. Are you not Trevor Belmont... the one who defeated Lord Dracula? Trevor: That I am. Though, I did not fight alone. There were many brave warriors beside me. And your name, sir? Hector: Hector. Trevor: Hector... I shall remember that name.
Trevor Hunts the Devil Forgemaster (Isaac and Trevor are engaged in a battle as Hector enters. Trevor dodges the first strike but Isaac manages to scratch him across the chest with the side of a blade at the end of his Chauve-Souris. Trevor retaliates by latching his whip round Isaac's spear thereby locking it in place for a second)
Trevor: You are not without skill.
(Trevor throws up Isaac's spear and quickly kicks him away. Abel dashes toward Trevor from the air, but Trevor quickly tosses throwing knives at Abel making him fall back. Isaac looks toward Trevor with a look of disgust as the two prepare to battle once more. Trevor strikes his whip toward Issac and the whip latches onto the Chauve-Souris. He pulls Isaac to the left then jerks him to the right, causing Issac to fall to his knees. Isaac looks toward Trevor with a look of hate as he swings his whip toward him. He backflips away as the whip strikes the ground, breaking the concrete. Trevor strikes again but Isaac quickly flips to the side as Trevor's whip misses and plows up concrete once again. Isaac lands next to his spear and quickly rolls toward it narrowly missing another whip strike. Isaac grabs the spear) Isaac: Ha! You vanquished Lord Dracula by a fluke, a mere twist of fortune. Yet I grant, you are adept. (looks to the side) Hector?
(Isaac rushes toward Trevor and tries to hit him with the side of his spear. He kicks Trevor's chest as he blocks the attack, and spins his spear and backs off) Isaac: I need not linger here any longer. I've gotten what I need. But mark me well... I will slay both of you, without fail. Without fail...
(Isaac fades away) Trevor: So he escaped... He fled when he saw you. There can be no doubt of it, then. You are indeed his enemy. Hector: Just as I told you when we first met. Trevor: Be that as it may, I am the one who shall vanquish him. Your meddling is unwelcome. Leave him to me.
(Trevor walks away) Zead: Pity. How unfortunate. Such a rare opportunity. Squandered... Hector: On the contrary. To obtain the vengeance I seek, Isaac must be slain by my hand alone. Ergo, nothing was lost. Zead: Think you so? Then you shall be glad to know where he is bound. Hector: And where might that be? Zead: The castle ruins where we first met. Do you remember the place? Hector: How could I forget? Zead: Well said. At the top of those ruins, there is a hidden chamber. It's there you shall find him. Hector: Then that is where I must go. Ah, I'd almost forgotten... Saint Germain gives you his regards. Zead: (curious) Saint Germain, you say? Did you meet him in the clock tower? Hector: Just so. He pledged he would no longer interfere in this matter.
(Zead holds up hand and walks to the side trying to deny what he heard) Zead: It cannot be. No, that is not possible... I must make haste to complete the final touches. I beg your leave. Adieu.
(Zead rushes off quickly. Hector watches suspiciously as Zead departs)
Trevor: Is that you, Hector? Hector: It is. I was told a hidden chamber lies beneath this castle. Isaac is there now. Trevor: What?! That's not possible. In order to open the passage to that chamber, the blood of my clan must...
(Trevor realizes something) Trevor: Oh, so that is why he fought me earlier! Hector: What is it, Belmont? Trevor: It cannot be avoided. You must show me just how much power you're gained. Hector: Wait. I have no reason to fight you. Trevor: This is your reason! Defend yourself!
The Belmont Blood is the Key (Hector performs a roundhouse kick that narrowly misses Trevor as he flips away from him)
Trevor: It's as if you're an entirely different person. So, this is your true strength... Hector: (slightly angered) Why did you attack me? Trevor: The place to which Isaac has gone can only be entered by those who possess very advanced powers. I had to test you.
(Trevor holds up his hand) Hector: I see. Meaning, you would have me pursue him? Trevor: Indeed. But first you shall need my help. Come!
(Trevor leads Hector toward the center of the room. he pulls out a dagger from his belt and quickly cuts his right hand and holds out his fist and lets his blood drip on the carpet. The blood shimmers then a portal forms where the blood once lay) Trevor: There. T'is done. Hector: So, the Belmont blood acts as a key... And what lies beyond this point? Trevor: Do not ask! If you knew, your heart might waver. For now, hold the image of Isaac in your mind. Think only of defeating him. Hector: Very well.
(Hector steps into the middle of the portal and starts to fade)
Trevor: Hector... Hunt him down. And when you have him, show him no mercy.
Dracula's Castle Revived (The engraving on the floor in the center of the room where Hector fought Dullahan starts to glow. Hector steps back)
Hector: What is this?
(The engraving lights up more as a crumbling sound is heard. Both Hector, in the Infinite Corridor, and Trevor, in the Abandoned Castle, look round in shock. The scene shifts to the ocean in the Mortvia Aqueduct as a storm rages and Tsunamis start to form. A bridge is shown rising up out of the water followed by a full view of Dracula's Castle connected to the bridge as lightning strikes in the background to foreshadow this unseen turn of events. Back in Infinite Corridor) Hector: This enormous power... Dracula's castle?
(Back in the Abandoned Castle, Trevor looks round concerned) Trevor: Have I arrived too late?
(Trevor suddenly leans forward from pain) Trevor: Groah!
(A dagger is shown exiting Trevor's chest from a backstabbing) Trevor: Fiend! What are you doing here?
(screen zooms out to show Isaac holding Trevor from behind) Isaac: I can't have you interfering beyond this point. I left that seal to Hector. Trevor: Impossible... The seal cannot be undone, except by a torrent of demonic energy. Hector could not know that...
(Isaac looks to the side and grins then plunges the dagger deeper into Trevor's chest as Trevor yells) Isaac: Do not equate a devil forgemaster's power with that of an ordinary sorcerer. For a seal like that, the magic produced in battle is more than enough. Placing a guard there proved to be your downfall. Trevor: Grr... Isaac: Enough talk. (kisses the back of Trevor's head) Time to die!
(Isaac quickly yanks the dagger out of Trevor's back and let him fall to the ground. Trevor falls to his knees then plunges to the floor as blood seeps out from underneath his chest. Isaac's laughing now fills the room and grows louder as the crumbling insues throughout the room)
The game is basically the same except Trevor carries all the classic sub-weapons with him, and can perform many interesting attacks as well as use the "Special version" (like Item Crush from previous games), including the "Grand Cross" spell.
Trevor plays like a hybrid between Hector and Leon Belmont from Castlevania: Lament of Innocence. He has all his classic sub-weapons from Trevor's previous game, but this time he can Special attack them like the Belmonts can in the previous games. His combos are just like his boss version, but executed similarly to Leon's and he has a new list of attacks. Unlike his boss fight in Hector's game, his whip doesn't have a green aura. He also collects stat increase items, and his stats boost when he defeats bosses as well, similar to a level up. He can also collect new whips that add new elements and colors. Lastly, there are no story points or cutscenes, but he does have a different ending than Hector.