Zenitsu is cowardly, weak-willed, and loud, often claiming that he doesnt have long to live due to the  job of being a Demon Slayer. He has rather low self esteem despite his talent and strength, even considering himself useless.  Zenitsu is also in a constant state of fear. he works with tanjiro and inosuke. he feels like girls should be single before they die, so he tries flirting with them which overrides his quiet personality. when he thinks his partners are flirting he complains about it.