RyoRedcyclone points out that, although Dan is generally written as a joke, he has some real ability: not only his fighting prowess was actually recognised by Gouken (he kicked Dan out, but that’s another story), but, since SFZ3, he’s also the official interpreter for Sakura in her journey around the world. He can speak Japanese, English, Cantonese, Thai and even a bit of French and Russian!
https://twitter.com/ryo_redcyclone/status/1365060163816800270