Trevor Belmont AP:
Seasons 1-3: Small Building level (Can fight people who can harm him,
defeated The Demon Priest and many other powerful monsters, who are stronger than regular demons who are capable of tearing humans apart. Pierced a weakened Dracula through the chest with a stake, though was unable to kill him due to missing his heart. His Short Sword and Leather Whip can hurt Alucard. The Belmont Sword is capable of hurting and killing the Minotaur, who's this strong via sheer size and could shake the whole Belmont Hold with his punches, it also managed to decapitate a near-death Dracula), at least
Large Building level with Morning Star Whip (Wears the same chain whip used on later seasons to break a magical barrier that Alucard, even at full power, couldn't),
far higher with Flame Whip Explosion (
By uniting the tip of both whips, Trevor can attack with a
massive explosion that was capable of one-shotting the Visitor, which tanked many of his whip strikes without dying). His whip
negates the durability of supernatural beings (The whip reacts to monsters and make them combust, exploding them from inside and turning them into ashes)
Season 4: Likely
Large Building level (Stronger than before, can fight with
Dragan, who was likely comparable to a full power
Alucard), at least
Large Building level with Morning Star Whip (Could break a barrier that Alucard couldn't and broke a good part of Dragan's armor that can tank hits from him),
far higher with Flame Whip and Magic Dagger (Fought and defeated
Death). His whip
negates the durability of supernatural beings
Alucard's AP: Should we leave only one key for him ? He has no statements or other notable feats to show anything new for a whole separated key
Large Building level (Stronger than Vampire Generals and feared by them. Was able to fight against a weakened
Dracula on hand to hand and actually harm him, whereas
Trevor Belmont and
Sypha Belnades were unable to deal any actual damage to his father, though he was ultimately no match. Managed to push back Dracula's fire-ball with help from Trevor and Sypha.)
However, we add a
Standard Tactics for him:
* Due to his rejection of his vampiric side or perhaps his benevolent nature, Alucard avoids using his maximum power at the beginning of his fights and will progressively use more of his real strength only if pushed to do so. This is seen in the fight against Dracula, where he is not able to hurt him initially, but over the course of the fight, proceeds to put more and more pressure on his father, eventually matching his strength. Thanks to this, scaling him to other characters must be done case by case
Dragan AP:
Likely
Large Building level (Strong even among vampires and could battle with
Trevor,
Sypha and
Alucard at likely his full power at the same time)
Death's AP:
Large Building level (Physically stronger than
Trevor Belmont and broke his arm with a single hit)
The reason I didn't added the "Likely" here is because his AP is already
vastly above Trevor's Durability, a mere backhand already broke his arm and that wasn't even his Scythe, so considering the scaling, I'm not against putting him at this level
Sypha's AP:
Wall level physically (Used her physical strength to kill a Night Creature), likely
Large Building level with Magic (Can harm
Dragan)