Here's my revised Marvel Super Heroes 2 roster, without any cuts.
Broken down into the main "factions" of the Marvel Universe:
Green - The Avengers
Blue - X-Men
Teal - Fantastic Four
Red - Street
Purple - Horror
Orange - Cosmic
Of course, there's some overlap (Silver Surfer and Super-Skrull are also cosmic, etc.), but those are the primary designations.

Broken down into the main "factions" of the Marvel Universe:
Green - The Avengers
Blue - X-Men
Teal - Fantastic Four
Red - Street
Purple - Horror
Orange - Cosmic
Of course, there's some overlap (Silver Surfer and Super-Skrull are also cosmic, etc.), but those are the primary designations.