Amos, your "imaginary playmate" was invented as a mere postscript to mine, and you don't have the right to do that. If you invented an imaginary playmate that was its own original story, its own original concept, that would be fine, and I would have no objection.

Then it would be your business.

It is not your business to invent a new family member of my character's family, because my character is my business and I invented his family! Do I make myself clear? You are violating my flipping copyright with this crap about "Chinga" and I demand that you cease and desist.

You could also invent some other chimp or orangutan or something that had a beef with Chongo, and that would be fine. No problem. But you cannot add members to his family. No sir. You are trespassing when you do that.