A new site popped up and has some nice new info on the game.
Check it out here –> http://www.geocities.jp/makoto_sat0u/jss.html
(Note: The site is in japanese. You have been warned)
Also here's a rough estamet of all who is in the game.
-CHARACTERS-
-PLAYABLE-
- Goku (Dragon Ball)
- Monkey D. Luffy (One Piece)
- Roronoa Zoro (One Piece)
- Nami (One Piece)
- Sanji (One Piece)
- Nico Robin (One Piece)
- Naruto Uzumaki (Naruto)
- Sasuke Uchiha (Naruto)
- Sakura Haruno (Naruto)
- Bobobo (Bobobo-bo Bo-bobo)
- Don Pachi (Bobobo-bo Bo-bobo)
- Yoh Asakura & Amidamaru (Shaman King)
- Yugi Moto (Yu-Gi-Oh!)
- Ryotsu (Kochikame)
-SUPPORT-
- Usopp (One Piece)
- Tony Tony Chopper (One Piece)
- Rock Lee (Naruto)
- Neji Hyuuga (Naruto)
- Hinata Hyuuga (Naruto)
- Shikamaru Nara (Naruto)
- Beauty (Bobobo-bo Bo-bobo)
- Heppokomaru (Bobobo-bo Bo-bobo)
- Raito Yagami & Ryuuku (Death Note)
- L (Death Note)
- Train Heartnet (Black Cat)
- Sven Vollfied (Black Cat)
- Sena Kobayakawa (Eyeshield 21)
- Hiruma Youichi (Eyeshield 21)
- Kurita Ryoukan (Eyeshield 21)
- Keiichi Nakagawa (Kochikame)
- Reiko Akimoto (Kochikame)
- Daizirou Ohara (Kochikame)
- Honda (Kochikame)
- Saruno Amakuni (Mr. Fullswing)
- Aya Tojo (Ichigo 100%)
- Hikaru Shindo & Fujiwara no Sai (Hikaru no Go)