Y'know I want to give Porco the benefit of the doubt and give him something that would make him powerful like Marcel....I know! Nine tails chakra aka tailed forms but he has control of the forms. I'll probably get rid of both brother's persona powers in replacement of the jinjuriki of the nine tails fox's powers
While is up for you and Cryonn to decide that, In my opinion. meh. if Jojo's bizarre adventure taught me anything is that in the right circumstances even the weakest ability can become OP. Take my character for example. Sure she doesn't have laser eyes but there is a lot of utility when you think about it. (Also story wise it would be jarring if your powers from earlier were just gone).