Atomic Postman
Vault Archives Overseer
Considering New Vegas is pretty much a direct sequel to Fallout 1 and 2, you'd be better off playing them first before beating the game.
Speaking of Marcus... I thought it would be really cool to have a part in Jacobstown's quest line where instead of Marcus helping in town, you could convince him to come journey the wastes with you and help other mutants in the Mojave. And Dr. Henry would take his place as the leader of the settlement
IIRC, Arcade Ganon never expressed his sexuality explicitly. His homosexuality is just part of his character, and you must actively seeking out to know it.