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.
"Semimaru" combines semi (蝉,"cicada") with maru (丸), a suffix typical of boy names. It might also be a wordplay on Semimaru, famous poet and musician of the Heian period.
In Spanish, "Ningarra" is the combination of the words Ninja and Cigarra (Cicada).
Origin
Cadin's design is based on a cicada, specifically the Japanese species called minminzemi, after its "min min" cry which is also Cadin's catchphrase. (Said species is also a catchable bug in the game, called Green Cicada in the US port.)
Cicadas are especially known for their courtship calls, which are particularly loud (up to 120 dB, one of the loudest in the animal kingdom) and usually performed at dusk to avoid the attention of predators. They're regarded as one of the symbols of summer, and in past ages, both them and crickets would be kept as pets for people to enjoy their singing. They also give their name to a type of ninja decoy techniques (typically removing one's overcoat and luring the enemy into striking it), called utsusemi no jutsu ("cicada skin technique").
Trivia
Unlike how Jibanyan, Dismerelda, and Happiere were the first three Yo-Kai Nate meets in the anime, Cadin is the first Yo-kai befriended by the player to fight Buhu.
In the E3 trailer for Yo-kai Watch, Cadin can be seen attacking, still using its Japanese voice. This was changed by the time the demo and final game were released.
