How powerful is Chromia?

[Paulbot]

Might be a reference to the Combiner Hunters - of which Chromia was a part of in IDW and toy exclusives. Will she have her sword?

[Tilarta]

Until I see her combat demonstration video, I cannot confirm how she fights.

There are three combat styles in the game, melee, ranged and hybrid.
Melee uses fists or sword, ranged is with a gun and hybrid can use either, although they usually tend to favor melee unless at great distance from a target.

Based on the picture above, it looks like she's intended to be ranged, judging from the handcannon she is holding.

[Paulbot]

Combiner Hunter Chromia had a different than usual paint job too, in addition to the sword, but that's the one connection I can make between that character and taking on Gestalts.