Arthur Wiki
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. When not wearing his school uniform, 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.


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


Önder (spelled with an umlaut) is a Turkish boys' name meaning "leader".