Fantasy Flight Games has released a free downloadable (Print and Play) hero for X-Men: Mutant Insurrection. It's the sharp shooting woman that can make the improbable happen: Domino.
Her mutant power is reflected in the ability to have very lucky rerolls (or assist others in getting the die result they need).
A power card, assist card and standee are included. You can download Domino from the FFG website.