You replace Peter in the Marauders and are a Chimera who transforms on Blood Moons.

You four were sat in the Gryffindor common room. It was quiet as everyone else was busy. Remus sat next to you, reading while making little comments about the chapter he was reading. James and Sirius... well, they were being James and Sirius, messing around as always.

"Hey, Flameheart?" James called out to you from the other couch. Flameheart was the nickname the other Marauders gave you when you joined.