I'm fifty fifty on obscure characters. On the one side. Right on! Add the most obscure characters you possibly can! Annie Sue? That's digging deep and giving us some fanservice. Not that kind, but the whole "here's a mythology gag/Easter Egg/rare character" type. On the other hand, I want to see a stronger focus on the main, let's say 10 and the band. The last movie had so many obscure characters getting the theatrical lime light they never did before, but a weird balance where Gonzo had a significantly diminished role and had to take on the burden of a brick joke. Rowlf and Scooter got more screen time than they did in the past several projects, but wouldn't it be nice to see more of them too... even though they always had smaller roles in even the Jim Henson era films?
Balance between the two is what this film needs. Obscure characters should get screen time, but also classic mainstays need some significant involvement in the plot.