Dazzler (Alison Blaire) is a fictional superheroine appearing in American comic books published by Marvel Comics, usually associated with the X-Men. She first appeared in Uncanny X-Men #130 (February 1980).
A mutant with the ability to convert sound vibrations into light and energy beams, Dazzler was originally developed as a cross-promotional, multi-media creation between Casablanca Records and Marvel Comics until the tie-ins were dropped in 1980. The character was created by a committee of Marvel staff, principally writer/editor Tom DeFalco and illustrator John Romita Jr.
Despite the fact that Dazzler was commissioned as a disco singer, the character shifted to other musical genres, including rock and adult contemporary. She starred in a self-titled series in the early 1980s which lasted forty-two issues, a Marvel Graphic Novel titled Dazzler: The Movie, a four-issue limited series co-starring The Beast titled Beauty and the Beast, and later joined the cast of the X-Men. She was briefly a member of the spin-off group Excalibur but has since re-joined the X-Men.
Source: Wikipedia, "[en.wikipedia.org/wiki/Dazzler_%28Marvel_Comics%29 Dazzler (Marvel Comics)]", available under the CC-BY-SA License.