Harksher is a ghost guppy who enjoys pulling pranks on people, scaring them, and sleep. When he and other ghost guppies have to think of a prank to pull, the ghosts would sometimes never rely on him for the best pranks he has in his mind. Although he scary and aggressive-looking, he's also timid and hides from strangers.
Harksher has dark violet skin, oval-shaped white eyes, black pupils, purple hair with big cowlicks sticking from both sides of his head, and a purple tail. His weight is the same as Oona's.