Dracula seems alright, but I think his NP should just be Rank A, since it's strong, but not immeasurably strong. Also, it should be noted that a lot of the people Dracula ate were Transylvanian dirt farmers he needed for food; only a portion would be soldiers and would-be vampire slayers. I'm also gonna enforce the huge mana drain because it's still a top-tier NP.
Also, I'm honestly a little iffy on the Infection skill, since it allows you to make an army of vampires outside your NP. I think if the bites created something like Ghouls, that'd be a bit better.

Aiisen, I like Sasaki Kojiro so I'm willing to allow him to be summoned as Assassin; we can just say the summoning ritual got bungled up. Again. That means we don't have to go out of our way to make sure one of our servants summons another servant. What I really need to clarify is his NP, since that seems to be an invention of your own. If I'm reading it right, he can't die? Or he has unlimited respawns, rather. Am I reading this right, or how many respawns were you thinking he should have?

Pious is mostly okay, but I notice his magic includes "Mind Control" which is always a big No for me in freeform, since it actively takes away player agency and it's tricky to resolve. If you don't mind, I'd like that to be altered or removed before you join.