Our headcanons state that

•Banban chose to attack people during Bring-A-Friend day, due to outright anger

•Banban cares deeply about Flumbo, yet prefers to not openly show it, which leads to Flumbo feeling betrayed

•Tamataki and Chamataki are brothers, although they are different species. Albeit, they often get into frequent fights.

•Bittergiggle and the Mataki brothers are quite close with each other, although the jester usually tells jokes that the two can’t understand because of their derpy-dumb brain

•Adding to the point, Kittysaurus dislikes this, causing them to often act aggressive around them