I think something pop/electropop (not the cutesy electropop thou) would work for them (including kuu btw), because they've all done pop and it's good.
They should really have a single, get 1 to 3 songs together and 3 songs individually
I would kill for that and I'm serious.
Omg I can totally see it, namie and kuu dancing around ayu who's tied up and being punished à la S&M
I could produce this ****