>>9892271It's from the War of the Bounty Hunters comic run. Fett has to compete in this arena in order to kill the champion as a form of payment to a doctor that is going to make sure Han Solo stays alive when the carbonite started failing as he was on his way to deliver him to Jabba. He didn't want the Kanji to have a vendetta against him so he paints his armor in order to disguise himself and calls himself Jango.