I'd like to see Keine have a transform move that turns her from defensive/dodgy human to heavy werebeast attacker. It'd be a nice thing. And yay, other people agree with my "priority to non-fighter characters" thing!
For Eiki I'm going to guess this will end up mainly ranged, with a melee rod attack. Possibly the rod changes damage based on something -- maybe the "mass" of the other attacker? To sub in for the "heavier if you're evil" thing? Or maybe how much damage you've done since you last took damage or something. Whatever. The mirror's functions in canon are to show someone's actions -- perhaps not a reflect, but maybe a Kirby-like "gain one use of the enemy's last move that touched the mirror"? Or something. The reflect could be there also, like Youmu's sword-spin from SWR. Very dodgy and twitchy with good short dashes but her sprint speed is nothing to write home about. Alternatively, and I'm not sure how bad the positive feedback would be, she could have a rod-based move that does more damage the more damage you have -- so it's a killer finisher but does jack all to a newly spawned player. That might be OP as balls though.
For Shinki, I'm thinking DAMAGE DAMAGE DAMAGE but literally no close-range power. All about really tight projectile blasts and lasers. Less dodge ability but maybe some sort of magic shield for more "dynamic" defense instead. Average speed, maybe some sort of slow magic "rocket" as her recovery "up B" move. Her melee would probably be low damage with knockback, like a little magic hand-flick or something. Possibly something kinda like Sheik's movable whip, where you deploy it and it hangs out there and can be moved, but with some sort of beam or lash or something, so that her schtick becomes "extended attacks" sort of. Using a "wing deploy" attack for a slow chargeup, maybe like Samus style, adds to the "long-duration attacks" thing. Maybe she charges her hands up and then can do a big deploy. Devil's Recitation is an obvious theme for her spell card, but if you want something less "of course," then perhaps she starts a series of explosions around the arena or something. After all, she *did* set Makai on fire with that card.
Alternatively for Shinki, magic amplification. She has to have setup. Her wings can be manipulated to give her extra stuff on her otherwise mediocre attacks. Or something.
Not a fan of Tewi, so what she gets is what she gets. But as for the luck thing, there is nothing I hate more in a game than "whoops you rolled badly," so I for one will be infuriated as all hell if she gets luck-based attacks...
Yuuka is probably a Ganondorf-like. Big chargeups, big attacks, slow as balls, heavy to move around. One thing I'd like to see played with here is some of her PC98 moves, including the ability to split herself into two individuals. One could argue that was a factor of the dream world, like maybe that was just a dream version of Yuuka, because her flower abilities don't directly suggest she can do this, but I'd still like to play with it. In that case she'd maybe end up Ice Climbers-style for a while, with one main controlled body and a 'tagalong" that assists for a move or something. Or maybe it's a timer on how long she can stay copied or something. I dunno. Alternatively, if Yuuka isn't assigned to HEAVY AND DAMAGING, she could go 'crowd control.' Slows, binds, weighing down enemies, stuff like that. Her distant weak attack could be a thorn throw or something, and she could have a vine motif for grabs and throws. Although I do kind of at one point want to see her just pound somebody into the earth or something. XD
Tenshi is Tenshi and already kind of has a template from SWR. I assume it'll be used.