[@Rune_Alchemist] Might be harder, but seems more fun to have two factions with having slightly different ideologies. One being proper defenders of Britannia and upholders of justice, and the other a group of eccentric and crass thrill-seeking individuals. 

Both will be organizations in their own right with their own hierarchy. One's just more professional than the other. Mission types would vary a bit as well.

[@Sho Minazuki] Nothing to technical. Just the principle of what magic is and what your characters can and can't do with it is.