In comparison to her younger twin, Lunaclub, Moonheart is the calm and collected one. As the member of the 4 Guards with power over water, she uses her Blizzard Blade to freeze foes. Talented and loyal, Megaempress considers her a reliable soldier and often sends her on missions. Moonheart combines with her teammates, Lunaclub, Flowspade, and Trickdiamond, to form the mighty Megatronia. Moonheart has a crush on Soundwave. Moonheart transforms into a helicopter, like her sister.