Some Better Call Saul thoughts-
I figure all of these characters are possibly reasonable to appear-
Wendy the hooker
The "fake" heisenburg
Gomez, Hank, the Albuquerque DA, the detectives, possibly even DJ Qualls' cop
Crazy 8 and Emilio
Guys that they may use but have no real story reason to
Huell-shows up after Walt
Bill Burr's character-
Fring-only for some Pollos type situation
Mike-iffy he should be used but they probably will. I bet iy will show him in some Pollos type role
Walt & Jesse-cameo
He's got a drawer full of phones with stories on each one. Assuming story will end with him getting buzzed for Badger's Uncle