Cadin is a Yo-kai with the appearance of a cicada with a light yellow body color, four brown colored arms, round eyes with black round pupils, a long field drab-coloured rostrum and eyebrows and an earth yellow colored head. He wears a green sleeveles kimono tied with a purple obi and wears a pair of zōri that contains a purple colored hanao. Beneath its sleeveles kimono, like every insect, has a dark green abdomen and on the back, he has blue transparent colored wings. He wears a katana around his belt that contains to have a dark red saya with the kashira of the katana being purple.
Known is that Cadin has the tendency to sleep and after every time he wakes up, he has a timer of one week until he falls asleep again. Cadin also seems to show a moderate amount of swordmanship, seeing as he know how to use the katana strapped to his belt. According to the medallium, he practuce "cicada ninjutsu" which is nothing and claimed that cicada ninjutsu might be a mastery of running away.
Cadin first appears in Yo-kai Watch in Welcome to the World of Yo-kai when the player captures bugs. They figure that one of the bugs is glowing not noticing its presence. Once at Mt. Wilwood, Cadin revealed itself after the player meets Whisper and after they received their respective Yo-kai Watch model. Cadin only apears after the player wakes up the Yo-kai Buhu. As Cadin was impressed by the player's bug-catching skills, he offers his Yo-kai Medal, allowing them to fight Buhu.
