Hm... I'd suggest Hero by Shiwoggi (I can't link with my phone, sorry, but she is in my favorite authors if you wanna read he epic supernatural Frerard. That makes it sound like shit... But it is really good xD)
Hm... If you're into smut, I_am_a_graveyard or xxFrankieioeroxx... (that one might be wrong... Try searching Gold Digger. It's an epic Frerard)
Hm... If you look at the Annual Ficwad Awards by Admin Smada, those are the Ficwad favorites.
Hm... Back in the Day by Monstrice(there are three numbers here by I can't remember what they are...)
Cosmic Zombie is a good read, but personally not my favorite.
Hm... Sorry, I say that a lot. You could read some of my stuff?
Or xXLaylaXx. I really like her superman/Frerard story... When she updates. Anywho... Ah fuck I just said that...
Love_it_or_Leave it has some decent stuff... Let's see...
Cancer Darling by Sleeping7Beast....
If you're into the mental twisting stuff, some of the stuff by Crack.
If you're into torture. 100 ways to torture Gerard Way by theescapist. Actually, anything by that author is fucking epic. I know Memento Mori has already been suggested, but some of her old work is really good too.
I don't rember any good vampire!fics right now... Actually, my brain is kinda failing me...
The 20 Ways by scarlet_finch or whatever her username is...
Um... Unitedsuck007 is a good one... (cries in a corner)
Hm... I think that's all. I've exhausted my brain. Did I already say you could check out my stuff? I think I did. I believe it's decent, but hey, I'm the one who wrote it so... ~that awkwad Moment when you try to self advertise and can't remember if you've already done it~