Not totally clear. He was a jaafari. There was this iranian series which dramatized the events; A gorgeous woman whose father and brother were murdered in the Aisha's war against Ali seduced the assassin to take revenge. Accurate? No idea.

He wouldn’t have been a Ja’fari because the Ja’fari didn’t exist until several imams later.

Thank you for the question! Basically yes: He was a Kharijite, which was a group that used to follow Ali but felt betrayed when he wanted to make peace with the Sunnis.

Thank you! And thanks for these threads - informative and entertaining :)