Merman Tsukasa has orange-yellow eyes, short scruffy blonde hair with peach tips, and his signature proud and big smile. His voice is firm and confident.

Tsukasa has bucketloads of confidence and loves to be the center of attention, although he easily gets carried away. his goal is to make everyone around the world smile. been noted as especially reliable and responsible person. He is hardworking and determined. He's a supportive brother to his frail sister, Saki.