For context, TCBH! is what TV Tropes would describe as a Fusion Fic, combining the worlds of MHA and Persona 5 into one. As a result, Persona 5 characters have Quirks on top of their canon Personas and MHA characters who meet the qualifications to have a palace as established in Persona 5 canon do have one (along with awakening Personas as well). And for this fic, Izuku Midoriya basically replaces Ren Amamiya as the protagonist of the P5 story and plot line (don’t worry, the author didn’t outright remove any presence of Ren in this story, but I won’t tell how), so everything that happened to Ren for his probation happened to Izuku (hasn’t my boy suffered enough in canon). And despite it not having been updated in a few years, it’s still a great read.