Knuckles the Hedgehog

Has a tragic story.
Once he was guarding the Master Emerald but his parents stole it and told him to fuck off.
They were just sick of paying his expenses when he did nothing but punch them to protect the Master Emerald.
So then he started working as a male prostitute in Chicago.
Years later, he appeared on Neo Tokyo as a wise cyberpunk hedgehog who was into creative stuff.
He then turned into a "sexy tiger girl" and, when a paramilitary guerilla of 4 SER members obsessed with Sonic Adventure 2 exposed his original identity, he was given the chance to reform as Shadow the Hedgehog.
Has undergone 2 sex change operations.

Not to be confused with Squishdiboo.