So let's see:
Persona 4 Playable Characters: Yu, Yosuke, Yukiko, Chie, Kanji, Teddie and Naoto
Persona 3 Playable Characters: Mitsuru, Akihiko, Aigis, Junpei, Yukari, Labrys, Shadow Labrys and Elizabeth
Speculation says this Sho guy is a new P4 allied character (due to the Yasogami jacket around his waist). Assuming this is true, this rounds the sides, even with the Shadow Versions of everyone, it just doubles. But then there is no Shadow Shadow Labrys, so that again puts P3 one character down. Evil Makoto would round it out again. With a surprise Margaret and Ken reveal to continue the round. And then reveal Kei Nanjo to relieve the fans who want him. I watched a playthrough of some of P1 and its was BORING AS HELL TO WATCH but he was the only character that stuck out to me (and I kinda wanna fight to "A Lone Prayer") Also "The #1 Man of Japan" is a kinda cool title I guess. It's the perfect plan. It must happen. It must.....