After some light researching, I've decided on working on an Apophis Caster. I'll work on a sheet for her.

EDIT: For Diogenes, I wanted to touch upon his moniker as a dog and thus use it as an excuse for a feral brawler; Pizarro was gonna be loosely based in "Gold" but didn't get farther than that; and Don Quixote would be a wild card that'd snowball either to a stronger Berserker with a female Master (who'd be Dulcinea and serve to fuel his delusions) or become more grounded and skilled with a male Master (symbolizing Sancho, his anchor to the real world). Newton was gonna be based in the evidence supporting his dabblings in Alchemy.