Zenitsu is an extremely cowardly and loud guy who wants nothing more than to be loved. He wants to get married before he dies to being a demon slayer, but he's too forward with women and it freaks them out or makes them angry. 
He has choppy yellow hair and brown eyes along with a usually worried expression. He's rather childish and clingy, making him one of the more annoying slayers. 
He was rescued from debt by his trainer, Jigoro and was forced to be a demon slayer.