Cooloon is the Pair Friend mascot of Ito Suzuno. She represents the element of cool. However, unlike Ito, she is a big crybaby, and often gets lonely when separated from Ito. Also unlike Ito, Cooloon is very friendly. However, Cooloon is considered one of the most mature Pair Friend of the group. She transforms into a keyboard during a Prism Live.
Cooloon is a light purple penguin with a dark purple heart on her stomach. She has pink cheeks, a yellow beak, and yellow feet. Her eyes are grey and she wears a small, dark purple witch hat with an indigo feather on the side.
Cooloon met Ito one day after she left a shop. She immediately clung to her and began to cry after Ito made her go away. Eventually Ito came to accept Cooloon.