I'm a Funko Pop collector, and wouldn't mind if they made some for Jackie Chan Adventures, one of my favorite childhood series. Thought I'd list a few ideas I had
El Toro Fuerte
Drago (Season Five)
Drago (All Demon Chi)
Drago (First Apperance; variant)
I figure it's probably a bit much to expect that they would do all the Oni Generals and their respective Shadowkhan, the Noble Animals, and various other incidental characters.