A new rumor suggests that one of Marvel's luckiest mutants, Domino, will be joining the cast of Deadpool 2.
Domino, whose real name is Neena Thurman, seems like a natural fit for the Deadpool sequel. She was a member of Cable's mercenary squad, Six Pack, before joining Cable again as part of X-Force. She's also been a love of interest for Nathan (as well as Colossus, who was featured in the first Deadpool). Since we know Deadpool 2 will feature Cable, and we know there are talks concerning an X-Force movie, introducing Domino seems like a natural next step.
In addition to being a skilled soldier and expert markman, Domino's mutant gift is probability manipulation, meaning things tend to turn out in her favor when luck is involved. It's a power that's open to a lot of interpretation, and the Deadpool 2 team will probably have a lot of fun playing with it.
Another point of interest is Domino's connection to Vanessa Carlysle in the comics. While she appeared to be a normal human in Deadpool, Vanessa is a mutant shapeshifter in the comics, and Copycat's very first appearance was in disguise as Domino in The New Mutants #98 in 1991. Domino didn't appear as herself until over a year later, in X-Force #8 in 1992. Whether this bit of history from the source material will be acknowledged in the film in any way remains to be seen.
Source: Heroic Hollywood