[@SSW]
Alright, that's fine. Let me know who you think up. Characters who don't work well in a team can be interesting to play around. But it might be a good idea to send them in first, because it's still an iffy subject depending on how much of a nuisance they are. 

[@Rondo of Blood]
Alright, Re-Roll
Took a bit to scrounge a good list together, but how about... 
[b]John Dee (Caster/Assassin)[/b] - He was a book collector who along with Edward Kelly rediscovered the language of angels. (Or demons, there is basis for both.) He had a massive library, and was considered a cunning mystic. Also, for assassin he was considered the Queen’s Spymaster. Something with little basis, but is still believed to this day. Giving him a lot to work with. (One of the books in his possession is said to be 'Book of Soyga')
Or 
[b]Chen Gong (Caster)[/b] - He was Lu Bu’s strategist. Lu Bu didn’t really listen to him, but fate lore has it that he had more influence than he did historically. In Fate, he's the creator of God Force, a weapon used by Lu Bu that is said to be capable of being all weapons. And a major strategist.