Another interesting tidbit about TWEWY. Apparently Shiki and Beat are actually using Pins to do their attacks. Shiki's Mr. Mew attacks are all fueled by a psychokinesis-type Pin called Groove Pawn. This gives all of Shiki's attacks a "Neutral" class (not physical/magical or 'positive'/'negative', if you prefer), just like Neku's Psychokinesis-type attacks. Beat's skateboard moves are all fueled by a Shockwave-type Pin and therefore physical (obviously). I still don't know about Joshua, but I'd guess he's the magical one.
SPOILER-Y
As a side note, if you -really- want to go by flavor, then the only Pin Neku can use is the Rhyme Pin (because it comes with a built-in Partner!). This allows him to do incredibly slow (but decent) physical (?) damage. Shiki can't do anything at all, Beat has to use his Reaper form to do anything, and Joshua is God and doesn't change at all because he can do whatever the hell he wants, Partner or no.
SPOILER-Y-NESS OVER.
Also, Tai, I think there's more of us than that who've played TWEWY, just go browse the RPG ratings topic. And FE8 is ranked, so I don't think there's too much trouble -there-...
-Djinn