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1) Shaw

2) Cannonball

3) Thing

4) Namor

5) S Skrull

6) Etrigan

7) U Thor

8) Black Adam

9) Graviton

10) Nu Supes

11) Hal

12) Annihilation Surfer

13) Warrior Madness Thor

14) Zemo/w moonstones

15) Thanos

Fight in rural Maine
no bfr

They COULD potentially clear, or at least, stop at the moonstones.

Clear?

Yup.

Vixen could copy other people's powers...and also, their skills.

http://i26.tinypic.com/91azag.jpg
http://i28.tinypic.com/w8omu0.jpg
http://i26.tinypic.com/2aifpc8.jpg

Not to mention, she could stack powers, I believe. Been a while since I read those comics. But Batman thought she could:
http://static.comicvine.com/uploads/scale_super/11112/111122629/3597763-9575142933-21454.jpg

So anyone on your list? Vixen would be at least as skilled, AND as powerful as them.

Animal Man can copy Sun Eaters. Sun Eaters, as their name suggests, eat suns lol.
http://static.comicvine.com/uploads/original/13/134509/2865159-animal_man_sun_eater.jpg

He can also duplicate himself like crazy (like bacteria).
http://static.comicvine.com/uploads/ignore_jpg_scale_super/3/30145/3951201-2135414-am_12_004.jpg

Beast Boy, could....erm....become a green monkey or something.

I knew about the sun eaters thing, but forgot about Vixen

Yeah. So in the Batman scan, he says she STEALS powers, not just copies (I read it again).

Doesn't look good for the gauntlet!

I don't think new 52 Vixen can copy powers from metas yet. IIRC She didn't do that in the short-lived new 52 JLI. So going by current versions I say that stop at Etrigan.

Has Beast Boy appeared dcnu?

The are all preboot