I personally think that X-men Origins: Mystique would be really successful seeing as she has one of the best back stories of any x-men character ever.

X-Men Origins: Storm would also be really interesting to see as she had an interesting story plot also (being a child thief in Cairo due to that evil mutant guy etc)

an X-Men Origins: Angela Cheng would also be successful and interesting to see where went wrong in her complicated past and how she got her shape shifting ability!

either of those and Nightcrawler would be awesome

X-Men Origins: Jean Grey

But we already got most of her story, well in the movie world anyway (what with the X-3 opening flashback).

I definitely think Mystique, but as much as I love Jennifer Lawrence I didn't enjoy her in First Class that much. She's not right for the role. Rebecca Romijn needs to come back for her, but that would never happen - especially in an Origins... or could it...

Jean Grey and/or Phoenix Force would be nice. I stan Famke Janssen as Jean

Mystique or Nightcrawler with appearances by Magneto, Mystique and Azazel.

I'm here for Storm (finally showing the badass African queen she is), Rogue and Mystique
I agree with Nightcrawler too

Mystique, though I guess they explore some of her origins in First Class.

Origins: Cyclops. They can show the backstory with Havok/Vulcan!

None. I need them to release Apocalypse in 2016 and then drop the franchise and reboot it a few years later.

All of the above sound awesome:
Nightcrawler would be amazing with his backstory with Mystique, Storm and Jean Grey/Phoenix too

Nightcrawler, Rogue, or Storm. They're overusing Wolverine, but I'd love for them to focus on Storm. They can give her a good actress that fits her backed behind someone who knows the comics and the character (so not whoever did X3).

Rogue has gotten the ****** end of the stick as well in these movies. She's powered down and useless in all three films. They could do so much more. Her character is complex. Mystique and Destiny involved would be interesting to the plot as well!

Hhfjdjdw, what a ****ing waste!

Mystique would be nice but her origin story was basically told in First Class

Storm and Nightcrawler would be interesting though

X men origins - Northstar (one of the first gay superheroes ever

NIGHTCRAWLER and ICEMAN!

MYSTIQUE
Nightcrawler

Rogue. She knows EVERYBODY. From the Avengers, to the Brotherhood..

Her backstory is interesting because she pretty much was orphaned once her daddy found out she was a mutant.

And they need to find a way to incorporate her snatching Ms. Marvel's powers to become the ROGUE we all know and love.