he has a couple of nicknames others may call him
when he served some time in prison for murder (until he got bribed out) another prisoner gave him the name “purpletrator”, being known as “the guy with purple hair that likes to beat people up”, and that nickname stuck with him even outside of prison nowadays
canonically a lot of other fellows call him by his middle name (thorwald) mostly because they think it sounds cool; in the toyhouse forums i actually call him thorwald quite a bit too since one of my friends on the site i talk to a whole lot also has one of her favorite characters of her own being named axel as well