I need a good graphic novel

[Zombie Gunn]

I really enjoyed 30 days of night. But, mainly looking for a non-superhero book. Something dark and definitely not anime/manga.

[Goldferg]

Depends what you mean by 'dark'.

'Fell' by Warren Ellis is a good read, if you've not read that
'Phonogram' is a bit wierd, but probably worth a look

and while you said no super hero stuff, if you've never read 'Sleeper' I highly recommend it

[Duckman]

100 Bullets would be a good start for something dark.

I'm not a superhero fan either but I can't recommend Watchmen highly enough.  It's about a lot more than just superhero guys and in fact only one of the characters actually has powers.

Peace

Duckman

[Exile]

Fell is excellent and its the same artist from 30 days of night.

I can see jesse really really liking Midnight Nation. Strong recommendation there.

Night Mary was a good dark graphic ill come back with a better list

[Goldferg]

Realized I forgot to add 'Girls' by the Luna Brothers to my list