There is actually a fourth game where this is possible, the entirely unknown Shin Megami Tensei NINE, also having a pseudo-MMORPG style that would be fully realized in Shin Megami Tensei IMAGINE five years later.
Curious about why Cerberus's design has only one head? This design choice is a tradition that remained from the original novel's depiction.
Fan Nickname: Andross for Omoikane. The protagonists of Devil Summoner: Raidou Kuzunoha vs. The Soulless Army, Nocturne, Persona,Persona 3, and Persona 4 are nameless in the game, but fans often use the names given to the characters in various manga and drama CD's based off the games.