So, I was thinking the other day than, besides from Reimu and Marisa, we got nothing from Touhou, so how about one of these:
Yeah, Touhou only gets a main character
-Bomb Square (probably all the danmaku Touhous): Player gets surrounded by "Fantasy Seal" spellcard (the Reimu one wich consist of spining rainbow energy ball-things) for a short time (4-5 seconds). While the effect stills the player has an improved defense and can use the ball-things to hit players while they're spining (kind of like curry on SSBB).
Eh. Could be okay, most people probably wouldn't recognize it. Reimu already has a bomb-inspired move.
-Power Square: Player strenght increase until the player dies (say, 2 extra damage to all attacks, minus 1 damage taken). Maximum 3 to prevent ultra god mode.
I think this would be a pretty boring effect, since it doesn't actually change the way the game is played once you pick it up. If it were implemented, it would have to be a percentage-based effect, or fast- and multi-attackers would get an insane boost.