Theory: what if that Yarn Planet from the end of "The Ball" episode is Little Bits' home planet? That Yarn Planet would appeared in season 3 playing a major role in one of its episodes along with Little Bits where she will reform and turn good like other villains reformed
What do you think about the episode called "The Legend"? Isn't it true that this episode is literally describing how Wander Over Yonder Fandom acts in real life?
As Frank Angones stated that the clue for season 3 villain was in there somewhere, it's possibly in season 1 or in season 2 (most likely in season 2 (?)), can you find that clue?
Since Frank Angones answered about Season 3 villain "Ego, Id, Super-Ego", I have a pretty theory about that freudian psychology, Ego is Lord Hater, Id is Lord Dominator, and who's Super-Ego, we will never know until season 3 is not gonna be confirmed someday (if Craig McCracken will of course go back at Disney)