So like, on Wart...um... well, I actually do like the character. So this is what I got...
I could imagine him being a summoner fighter, having a lot of moves for zoing purposes. Though he also has a bulky body, right? However, I honestly can't imagine him using it for a lot of attacks lol. I think the bubble shot should be included, as it's pretty iconic. Using vegetables would ironic considering he hates them (but whatever works, I guess).
Anyway, he could perhaps summon minions in means of attacks. So like Shy Guys, Snifits, Phantos (perhaps they could be like homing attacks), those bird enemies (could also be a recovery or maybe the magic carpet?), etc. Heck, maybe even use those Subcon fairies he imprisoned. Maybe he forces the fairies to carry him as a recovery move? Lol, or maybe use magic attacks? The whole notion of "Subcon" though, is a dream world. So, although it's a bit of a stretch, Wart could have some trippy, fantasy-like moves that could also revolve around mindgames, representing what Subcon really is, if you get what I'm saying.
But yeah, not like I'm expecting him or whatever, but I always loved SMB2. And as a kid, those Phantos scared the crap outta me. O.o