I have remembered @mutant-jojos exists so I had to do my blorbo Ikuro Hashizawa!
A polite 17 year old who, up until a few weeks ago, could have passed as a normal human. Tragically, his family got in a car crash on a backroad - killing his parents and activating his mutation: Cellular Control! It hardened his skin and produced a new organ in his forehead that acts as a 'control center' of his mutation. He refuses to unpack just how that works or how that'd effect his skull - just don't touch it.
While his circumstances are tragic, at least he has found a friend in the orphanage's resident telepath - Sumire!