I never really gave Bub and Bob in Smash that much consideration beyond "I like this game, it'd be fun to have in Smash", but now I think about it, those bubbles could be an awesome command grab/projectile combination - I could imagine them as going in an arc rather than staying in place, but still trapping foes in it - essentially being the ultimate combo tool, cancelling out DI and forcing a set knockback regardless of weight or damage. Should be blockable though.