Urgh, it's all pixelated

I've been working on something recently. I then started making some familiar faces.

You came for posts, you stay for games,

see how many you can recognise! 

highlight below to reveal answers

1. Heisenbergs/Walter Whites

2. Old Gregg and The Hitcher

3. Ash and Pikachu

4. Mario and Luigi

5. Donnie Darko

6. Edward Scissorhands

7. Luke Skywalker and Darth Vader

8. Finn and Jake

9. Snufkin and Moomins

10. Mystery Inc.

11. Scott Pilgrim and Ramona Flowers

12. Just some Zombie