I'm fairly positive that, no matter what outfit she's in, she's gonna be using her staff. I don't know how many times it's been said in this thread, but the Adventures move pool has HUGE potential for a Smash move set, and there's no one better-suited to use it than Krystal*. Assualt's pool, while also viable, can apply to pretty much everyone in Star Fox. I'd say Wolf should get it, but it seems that Fox is sporting a Wolf costume...=( Falco-lovers can rejoice, though, as now he has a move pool all to himself, as long as they don't add in, say, Peppy or Slippy.
I digress. But another thing I'd put money on is, if Krystal makes it in, the fanfavorite bra-and loincloth combo won't be joining her. On top of the other reasons I've mentioned, keep in mind that Fox's model is based off his Command artwork. Not just the clothes, his physical appearance. If they use her Adventures getup, she'd be the first character not to match the other characters from her series.
I'm still waiting for a compelling reason to opt for Adventures over Assault/Command, and until then I'm going to remain vehemently anti-fanservice Adventures costume.
*Fox was technically a candidate since he was the one who actually used the moves, but we know he can't use it.
Mr. Ocax: way to prove your own ignorance about this community and the furry community in general. If you're only purpose is to troll for flames and lulz, please leave.