i found a bug, when player and teammates (phil & ralph) defeated while transformed,
they'll be stuck in their form for every battles onwards.
Viewing post in Mahō Shōnen: Magical Battler comments
Yeah i just had the same issue, no idea what triggers it, but I got Protagonist, C. 1 and C. 2 all stuck in the merged form (although C. 2 didn't have his transformed sprite, he had the attacks) not sure if u can get C. 4 stuck... (The method i used consisted in fighting Pink Demon in the training room and then transforming -> Losing)