NES collage!

Starting from top left:

Kid Icarus

Duck Hunt Dog

Robocop

Little Mac- Punch Out

Samus- Metroid

Godzilla

Shinobi

Kirby

Ryu Hayabusa- Ninja Gaiden

Dirk the Daring- Dragon's Lair

Spy- Spy VS Spy

Super Mario

Link

Egon- Ghost Busters

Bionic Commando

Swampthing

Bubble Bobble

Rocketeer