Cancer

Cancer The Crab is a Celestial Spirit that is summoned by Lucy Heartfilia who is also her hairdresser because of his weapon which seem to be two large pair of scissors which he can also use to cut hair. Lucy uses Cancer to cut her hair or make a new hair style for her or her enemies. Happy first thought he would end Cancer's sentences with "kani" (crab) however Cancer actually says "ebi" (shrimp) at the end of his sentences, this shocked and displeased Happy.

Daybreak arc
Cancer is first summoned to fight Duke Everlue, however he thinks he is being summoned to give Lucy a haircut. After the confusion ended, Cancer helps Natsu Dragneel defeat him by cutting off what is left of Everlue's hair and mustache.

Tower of Paradise arc
Cancer is breifly used to defeat some tower guards by giving them bald haircuts.