Emerald

A Dimensional Drifter... has a core either showing on his chest or replacing his heart... It's the Fragment of the Master Emerald from Sonic's world... or one of them given how many there are... Emerald is older than he looks despite looking to be in his 20s and has a unique yet odd OP ability called Ultimate adaptation... a skill that allows a passive and active effect to grow stronger faster than one would expect and learn things at a rate, which would be impossible normally... he is able to learn many things, and thanks to the Master Emerald fragment, virtually immortal... if he dies, respawns from the master Emerald, if the Master Emerald gets destroyed, he can restore it... if the master Emerald exists... so does he... normally travels Dimensions for fun or to protect or destroy worlds... so do what you will with Emerald here... he is neither a hero or villain so he can fit any role... so RP him with what you will... though a bit dense, has a few ladies crushing on him.