From Left to Right: Aggie, Courage, Dipper, Mabel, Norman, Coraline, Double D, Ed, Gaz, Eddy and Dib. Together they're the Mystery Dorks.
Concept Art of Mystery Dorks:
Gravity Falls belongs to Disney.
Coraline and ParaNorman belong to LAIKA.
Ed, Edd n' Eddy and Courage the Cowardly Dog belong to Cartoon Network.
Invader ZIM belongs to Nickelodeon.