It would certainly be nice to see Qi'ra again (voiced by Clarke, hopefully) - I'd certainly like to know what happened to her in the years leading up to the Rebellion. I know her fate has been covered in some recent comics but I'd like to see some canon development on screen.
(Honestly if we saw any follow-up to Solo, which for my money is the best live-action stuff that isn't Andor or Rogue One that Disney has produced, I'd be happy.)
Ahsoka was distinctly a curate's egg, but weirdly most of my gripe was with the combination of the casting and not explaining what had happened to the characters since Rebels. Ahsoka had become this grim uncommunicative ex-mentor and Sabine had become this grim self-destructive ex-mentee with no real explanation of why that was the case. But once it got going, it got good. Huyang was great, Hati and Skoll were great, dream Anakin was great.
(Also not a fan of the New Republic being determined to be as incompetent as possible right out of the gate, that really takes the joy out of overthrowing the Empire. That really wasn't necessary, it doesn't make the protagonists look better, it just makes their world more stupid and poorly thought out.)