The new unicorn-shaped cereal pieces will replace the traditional hourglass-shaped marshmallow, joining the other seven shapes - including hearts, stars, horseshoes, clovers, blue moons, rainbows and red balloons - made from whole grain oats and enriched with 12 types of vitamins and minerals.
The company noted this is its “first-ever marshmallow” to be inspired and created by kids.
“Both boys and girls agreed that these mythical creatures had timeless magic that was the perfect fit for the only truly magical marshmallow cereal,” it said.
Josh DeWitt, marketing manager of Lucky Charms, said: “Our goal is to not only create a cereal that families and cereal fans will love and enjoy, but to inspire magical possibilities and help spark imagination and fun, no matter what the age.”
General Mills has asked social media users to vote on the new unicorn-shaped marshmallow using an appropriate emoji.
Magical Unicorns have already begun to appear in boxes of Origin and Chocolate Lucky Charms cereals, but will be rolled out throughout the US in March 2018.