Hmmm.... special moves, fighting styles....
Rin would, of course, use kicks, maybe the occasional headbutt. Gotta figure out some method of incorporating her painting... maybe give her some Okami-style brush-stroke attacks that can strike from a distance. Maybe a quick long-range attack where she paints a butter-fly onto the air that flies across the screen as a projectile. Rin's a rather distance introverted person, and I think she ought to focus on ranged attacks and such.
Hanako's tougher to figure, since she's so non-confrontational. She'd have to have a sort of hit-and-run style, hopping kicks, spastic slaps and retreats. Maybe give her a poke/charge attack involving a pool-cue, or something where she summons giant chess-pieces that fall from the sky.
Emi'd be the speed-queen, of course. I can picture her using a dash-attack similar to Fox's Fox Illusion in Smash Bros.
Lily's rather reserved... since she's blind, and walks slowly, I figure she'd be more on the Mighty Glacier end of things. Good reach, thanks to her height and cane, but low mobility. I believe someone already mentioned weaponized tea-cups.
Shizune... I kind despise her, so I'd end up giving her a crappy move-set and making her night useless.
If was I
was going to handle her objectively, I'd probably make her special moves focused on quick combos involving signing. You might also give her a projectile attack where she writes a note and hurls it like shuriken.
If this game
does get made, I'd like to see more characters, and hopefully, none of the character will be too overpowered. Other possible characters...
-Misha. Drill-attacks, crushing hugs and excessive volume attacks have been discussed already, I think.
-Miki. I picture Miki as being just a tad slower than Emi. You could give her a gimmick where she uses various weapons to replace her missing hand... or an attack involving a circular saw, if you want to get a little morbid.
-Akira as the Drunken Master. Weaponized wine-bottles out the wazoo.
-Emi's Mom as a Mighty Glacier who fights with cooking utensils.
-I'd kind of like to see Hisao as a joke character. His special attack would be having a heart-attack, thus giving the opponent and instant victory.