Adachi, baby.
No spoilers!
Tohru Adachi, Persona 4’s assistant detective and comic relief, makes his way to Persona 4 Arena Ultimax‘s roster as DLC that will be bundled with first-run copies of the game in Japan, according to the latest Famitsu. Gematsu says that he has his own Persona (Magatsu Izanagi) and will have his own story.
Seriously, no spoilers!