Buttercupstar

The kit intended by Sunclan to be the next leader of Tundraclan (hence the 'star' suffix, which they received after death), sending a prophecy to the clan in which a lot of buttercups grew in the nursery while their parents were going to Moonclan to receive the kits' names. Starclan sabotaged this though by causing these flowers to wilt quickly, resulting in them coming back to rotting buttercups, giving them the impression that Moonclan had decided that Buttercupkit's sibling was to be the heir and Buttercup was killed. They went to Sunclan because they should have been a leader.