Sona

Especially interesting in this regard are furries with more than one fursona. […] Consider, for instance, how Muse describes his two fursonas: My two current sonas are a bat and a rabbit.

A sona’s main job is to represent the artist who created it. A sona is sort of like a self insert character in a fanfiction.

Look, if you didn't have a Sonic 'sona' (not that we called them that, all those moons ago when I was young) when you were a kid then have you really lived in fandom?