3. Obscure Characters From Obscure Games
People will turn to the "cool" characters in really obscure games that no one has ever heard of. If the developers wanted to include such obscure characters in order to market them, they would, but unless a sequel of that game is coming out soon, there would be no point. Especially for a game like this where the initial cast must be able to please the majority of people. Sure Fat Princess was someone of an odd choice, but it technically makes sense. Yes there are random characters who would fit in this game surprisingly well given a correct moveset, but that really isn't the point. On the opposite end of the spectrum, but relating to the previous number.....