Created by Mark Gruenwald, Bill Mantlo, Steven Grant, and John Romita Jr., the character first appeared in the comic book Marvel Super-Heroes: Contest of Champions #1 (June 1982).

[7] Shamrock is possessed by the souls of thousands of victims of wars who manifest themselves as poltergeists which affect probability within a 20-foot radius of her, altering situations so that she is given an advantage, in essence having "The Luck of the Irish.

"[2][8] Jack Beresford of The Irish Post stated, "Though far from a fan favourite, Shamrock remains a character of huge potential.

[...] Far from a popular presence in the world of Marvel comics, should the MCU succeed in resurrecting this decidedly one-dimensional Irish superhero stereotype, then it could rank among their greatest achievements.

"[9] Nicholas Conley of Grunge.com asserted, "Now, one aspect of Shamrock's origins that is potentially interesting is that her body has supposedly become a vessel for the many souls of innocent lives lost during war, a concept that could be fleshed out.

"[10] Eric Nierstedt of ComicsVerse wrote, "Molly Fitzgerald is authentically Irish (born in Dunshaughlin), and has a unique power.

"[11] Matthew Wood of CBR.com said, "A red-haired woman who dresses like a shamrock-themed billiard ball, Molly Fitzgerald's usually seen as the most stereotypically Irish hero imaginable.

Shamrock boasted that her luck powers would allow her to prevail in a fight against him until Deadpool began conversing with her about how hard it must be living with her insatiable hunger, but having nothing to eat.

In having admitted that, her own power worked against her, increasing her luck that she could be killed which Deadpool was happy to help her accomplish, cutting her in half, lengthwise with a katana.