No. Heck no. It just doesn't seem right, they're... apparently, I don't believe the Wario franchise is part of the Mario franchise. I STILL don't believe Waluigi should be considered part of the Mario franchise.
But if they did appear, I'd like to see Dribble and Spitz. Characters I liked most from the first game. Also liked 9-Volt and the afro disco guy, but I could live without them. Never played any of the other Warioware games.
For some reason, I always thought Wario looked his best in the Greek fisherman hat. Made him look like he was on safari. Since I hadn't completed Super Mario Land 2 by the time I saw Wario Land, I just assumed Wario was always supposed to look like that.