The Persona team. Even after Catherine (which I absolutely hated) I will still play any game that they make.
I suppose that's easy to say when their next game is Persona 5, but whatever
(Note: I am also super-excited for the Persona fighting game even though it looks completely ridiculous in an awesome way, but it doesn't count because it's not being made by the same team. They did the smart thing and outsourced it to the BlazBlue guys. Wheeeee)