A mascot is a teammate who is utterly useless, and is just around as fodder or moral support.
Lemi's being a mascot and camping on the roof.
Mascots also appear in Japanese anime cartoons, where they provide comic relief and sometimes contribute to the plot.
Holly Hobbie was a popular American mascot in the 1970s.
The anime "Revolutionary Girl Utena" has two mascots, Chuchu the mouse and his friend the garden frog.