This is the page for the 2nd Harlequin in DC Comics continuity, Marcie Cooper.
Granddaughter of the original Manhunter, Dan Richards, Marcie Cooper joined the alien Manhunters who had a plot to take over Earth. She got a job at a radio station KGLX, in Gotham City, with Molly Scott, the first Harlequin.
Marcie started dating Northwind and later Obsidian, both members of prodigal heroes Infinity Inc., and later started to infiltrate them.
Stealing Molly's illusion casting glasses she became the third Harlequin and betrayed the Manhunters, attempted to recruit Obsidian to the Manhunter's cause, failing she killed her grandfather for betraying the Manhunters.
She then tried to destroy Infinity Inc. and joined Injustice, Unlimited. She tricked Solomon Grundy into touching Mr. Bones's hand to Skyman's face, killing Skyman. Realizing what he had done, a horrified and angry Solomon Grundy killed Marcie.
Powers and Abilities
Her primary tool was her glasses (Later explained as a gift from the Manhunters as one of their agents) which: 1) Projected realistic three-dimensional holograms, 2) Fire energy blasts, and 3) In recent years, enabled an aged Harlequin to "maintain" the physical vitality of her youth's athleticism.
Her secondary tool is a mandolin with an extending handle which she uses as a defensive weapon. (Especially against the Golden Age Green Lantern due to his weakness to its wooden construction.