Wander over Yonder was an okay show for me but I enjoyed Kid Cosmic. The two styles together look really good, looks like they really blend in together well.
You forgot about Lord Hater's lightning horns, then again Hater without those horns looks more fitting for him. I'm kind of curious why Peepers is admiring Queen Xhan though.
This crossover idea could have potential, expanding like a inner universe of Craig Mccracken creations. An interaction between Kid and Hater or Peepers and Chuck sounds pretty fun, unfortunately both shows belong to different companies respectively and both have already ended