Adils friend
Grade 3rd
Gender Male
Animal Cat
Hair color Brown
Complexion Tan
Residence Istanbul, Turkey
Cartoon debut "Dear Adil"
Voiced by Evan Smirnow

Onder is Adil's best friend and classmate.

Physical appearance

Onder is a cat with a tan skin complexion, he wears a long-sleeved orange shirt with light yellow stripes and a white collar. His pants are a dark grey and his hair is a chocolate-brown color.


Very similar to Buster, Arthur's best friend, Onder struggles in finishing math assignments and has quite an imagination, such as when he thought that his teacher would throw him into the Sea of Marmara for not finishing his homework. He also admits that he can't swim.