I've been playing this non-stop, I'm somewhere around the final level/stage in Tartarus. I have the PSP version of the game which came out last year, I think, I don't remember. It's really awesome, part RPG and part dating sim, but the characters are really fleshed out throughout the duration of the game and aren't two-dimensional caricatures like some other RPGs (I'm looking at you, Final Fantasy), almost like they were designed after real people.
So in celebration of the fact that I'm obsessed with this game, I'm going to type the characters:
Yukari Takeba: IEI or ESI
Junpei Iori: ILE (or SLE)
Mitsuru Kirijo: LIE
Akihiko Sanada: <3 Delta ST (LSE > SLI)
Shinjiro Aragaki: LSI
Fuuka Yamagishi: EII
Ken Amada: Too young to type.
Ryoji Mochizuki: ILI or IEI
Takaya: Actually don't know, rational something. Maybe EIE.
Jin: Not shown enough but some IxTj, maybe LII.
Shuji Ikutsuki: ILE
Kenji Tomochika: Alpha SF
Hidetoshi Odagiri: LIE or LSI
Chihiro Fushimi: I have no idea. A very unhealthy individual of any type. People like that should get help.
Keisuke Hiraga: IEE (THE ONLY IEE IN THE ENTIRE GAME)
Kazushi Miyamoto: Beta ST (SLE > LSI)
Yuko Nishiwaki: Definitely S and maybe T.
Anyone who has a PSP should get this game, it's awesome.