Pikkon and Dabra? good picks. I wouldn't mind MUI but I've heard SSBE brought up and I think that would fit better as an install. It's really not that unique.
I don't actually mind this idea. The barrier makes sense. Magic Slime Hajyu is another ability he could use:
Like in Supersonic Warriors 2?
If it were up to me I would just have him be playable. I'm of the same opinion as this Kotaku article.
https://kotaku.com/theres-a-chiaotzu-sized-hole-in-dragon-ball-fighterzs-r-1822268453
Plenty of techniques like Dodonpa which he spams in character, the Super Dodonpa which is actually exclusive to him:
His Telekinesis projectiles, Psychic/Paralysis abilities and Drill Attack. Perhaps even have his TK stop some projectiles dead in their tracks: