Janice is one of my favourite characters, so I'm happy to see her. I loved her random 'valley girl' remarks in the old show and movies, and the exaggerated design of her head. She is the Electric Mayhem's guitarist though by the way, Zoot plays the saxophone.
Not having Scooter would be disappointing, I'd rather have him than Dr. Bunsen. Nothing against Bunsen, but Scooter seems like such an integral character (even though he's kinda boring to look at). Also really missing are the aforementioned Sam and Rizzo, and Pepe the prawn.
If this list is correct, then I'm really hoping to see a second set to round out the band with Zoot, Floyd and Dr. Teeth. You could fill the other spots with the likes of Beauregard, Pops, Hilda, Crazy Harry, or Marvin Suggs to name a few lesser characters. You could even have Kermit in his investigator raincoat, and an alien from the planet Koozebane. :)