I reckon #4 is Skurai, #2 is probably jamer, and I'm leaning towards #1 being D3V.

I think I know #12, but I'm not saying who because I did a search to confirm my thoughts. My initial thoughts were wrong, amusingly.

EDIT: No, I'm going to change my mind on #1:

1. !K_A!
2. jamer
3. Mutant Couch
4. Skurai
5. D3V
6. Thanatos

10. D3V

14. D3V
15. D3V.
16. Skurai

17. I'm going to go out on a limb and say Wallow.
18. D3V.
19. D3V.
20. This amuses me. So I'm going to go for D3V.

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Are you going to update the first post with the right one?