2. Badger & Skinny Pete
I would happily watch a spin-off series focussing on Badger and Skinny Pete's relationship and antics. They often served as the comic relief around Jesse when his life was spiralling out of control. They pose as the true meaning of likability - they know what they want and are content with it, often doing things that are considered bad but wouldn't be considered bad people themselves. That's a testament when during the first episode Badger appeared in he tried to shoot Jesse with a crossbow. But as fantastic as it would be to see these two again, it's highly unlikely to see how they would fit into Saul's stories. In the season 2 episode of Breaking Bad, Better Call Saul, Saul defends Badger against the DEA after he has been busted for dealing. But Badger doesn't call him, Jesse does, on the basis that Saul has successfully defended a friend of Jesse's twice. The fact that Badger doesn't call Saul himself would hint that they didn't know one another beforehand. Once again, a cameo may be on the cards, rather than a regular role.