How do you know he won't appear in s3?

Nevermind...

Third option: a new Darkwing series spun off from DuckTales 2017.

@Kilmarnock228 Maybe. Jsyk, the second option was inspired from Adventure Time: Distant Lands.

I was hoping he would appear in season three. Seeing a superhero fight their evil counterpart is my favorite type of story.

Actually there is going to be a reboot of Darkwing Duck on Disney+. Negaduck is very likely to return as Darkwing's evil counter-part/ archenemy.

@Invader Sklir Yeah, I heard about the reboot.