Kamen will be portraying a character named Dawn. Though the exact nature of Dawns role was not revealed, she is described as charismatic, eccentric, unpredictable and damaged. Its not clear if Dawn is a new character created for the film or if she is adapted from the comics; while there are several characters named Dawn from which to draw in the comics, none of them seem to have a rich history as a supporting character in any Ant-Man stories.
Kamens Dawn is one of 3 female roles added to the sequel, joining the yet to be cast Janet van Dyne and one more surprise role. While the role may well be cast at this point, we can tell you that the studio was searching for a Latino actress for the role of Victoria, who will join the cast as the love interest for Michael Penas Luis. Described as a bit of a loose cannon, Victoria will be a part of the films comic relief but is also described as tough and smart with a dangerous edge.