Sega Announces new 2D Sonic title

[Crappy Blue Luigi]

technically grounder was in sonic 2 in aquatic ruin, but he was red
and scratch is arguably in it too, as an enemy from Wing Fortress

The Scratch and Grounder in question were based on those two enemies, though I'm not sure about Scratch. EDIT: ninja'd, see above

Think of them as if they were Paper Mario-like party members. They take a generic enemy/race from the series, give it some defining qualities and a personality. Except in this case the latter is terrible.