Hes called Dementia.
Im thinking hes very much his fathers son. Problems gonna be not to make him too much like his father. Or too villainous. With Celestia as his mother after all
The question is where, how and when he appears anyway.
Im thinking hell be the most fun to play off the main 6 as they currently are. Maybe a time travel thing? And hell just smile and knowingly nod to himself as he pranks various ponies together with Discord. Yes, that might be fun.
And then he parts ways with the words You take good care of mother now. Bam.”
What about it? Just like Fluttermac, people ship it. Beside it would be quite repetetive if Discord only had one ship with Fluttershy.
Dissy gets a Gala invite after helping feed the nation’s mojo to Centaur Satan? Yeah, this kid would have to be shooting stratospherically high (or low) to top that.
Way things are, you could probably let him get away with slightly more than you’re thinking.