I've came up with an idea of a crossover between The Brak Show and Rick And Morty. The character in the blue and on the right is Brak, and other in the red and on the left is his little brother Sisto. If you don't know who Brak and Sisto are, they are these catlike alien space pirates who appeared in the original 1966 Hanna-Barbera animated Space Ghost cartoon. And only Brak appeared in Space Ghost Coast To Coast and Cartoon Planet. Brak became the main character in Space Ghost Coast To Coast's spin-off The Brak Show. Sisto appeared in The Brak Show from time to time, but he has not made very much appearances, nor has he talked in the show. I imagined Sisto being voiced by the voice actor Andy Merrill (who is the voice of Brak) and would sound like Brak, but with a childish voice (which means his voice would be a little high-pitched). I also imagined Sisto being very intelligent and a lot smarter than Brak. I don't know much about those characters, I don’t think. But I do like them a whole lot. Sisto is Rick, because Sisto is very intelligent (in my head canon) and Rick is a mad scientist genius. And Brak is Morty, because they have different personalities, but they are a little bit similar. I also chose Brak as Morty, because I thought, "Why not?"
Note: That's Brak and Sisto (Brak is the one on the far left and wearing the black and blue uniform, and Sisto is the one on the far right and wearing the black and red uniform, http://www.animationmagazine.net/wordpress/wp-content/uploads/brak-show-post.jpg
Brak and Sisto belong to Hanna-Barbera, the Space Ghost series franchise, The Brak Show, and Cartoon Network/Adult Swim.
Rick And Morty belongs to Adult Swim.