- They're just very long and are the same color as his skin.
- Specifically, she has Asperger's Syndrome. Think about it: She doesn't understand how to interact socially and she's quite Wise Beyond Her Years. She also gets quite anxious during stressful situations.
- Why do you think he always hangs out with the kids? He's especially thirsty for Rita because she's the youngest.
This would at least explain her protective, motherly tendencies and why the kids don't seem to have any real parents.
The Queen gave birth to the kids, and gave them to Dodos to be raised like worker bees and ants take care of larvae. It's why she knows Bello was raised by Grandpa Dodo.
Proof: In "Rita Adopts a Dodo", he says "Oh, mama!", and in "Jammbo's Many Worlds", he says "Oh no!" multiple times.
The beatboxing/gibberish language he speaks is a traditional Jammbonian language. The kids and the Queen are fluent in this language but speak English for the sake of the audience. The King doesn't speak this language, which is why in "Royal Frame" he reacted in confusion upon hearing it (then again, if the King doesn't even remember Ongo's name, he definitely wouldn't understand the language he speaks).
Signs of being offbeat include sparkling, mismatched eyes and an odd, dissonant voice. Offbeat Jammbonians don't typically live to adulthood.
Ongo has eye-obscuring bangs and doesn't speak English because he doesn't want his friends to know, and is so in touch with his surroundings because he wants to enjoy life while he still has time.