All good points, but I have some counterpoints I'd like to voice, Re: heroes.
>Rupert Giles, from the Buffyverse.
>I disagree with this, not because of his lack of expertise, but because the Aurors already do what he does, and we already have Aurors.
This is valid, but then again the Aurors tend to be sent into battle, which could be bad if we need somebody to do research while they're engaged in combat.
>Dr. Todd 'Lazarus' Lazkowicz and/or a copy of his Magic Cryokit's EMH, Schlockverse.
>Would be extremely useful, considering how much of his technology we use.
No complaint here, I think he's pretty much a guaranteed pick.
>The Mentor, from 'Orcs Must Die!' and a blue outfit for him
>Placing rows of traps could be useful, but get a player character from Sanctum instead, to better make use of the Antaeus's schematics. Rows of bolters beat rows of ballistas.
>Could have merit. Silence, Instant gib, confuse, and can train in the FFT classes. A solid choice.
I don't know much about either of these characters, but you make good points here.
>A certain non-reploid who will not be named.
Please elaborate on what makes him unsuitable.
>Nikola Tesla and Carl Sagan (Atomic Robo)
>If google doesn't tell me the character's capabilities, I veto. It doesn't, ergo, veto.
Basically, they're super scientist versions of the actual people in the Atomic Robo universe. Tesla created Atomic Robo, a robot that is a genius his own right, and has experience in dealing with Occult matters.