A pale grey-skinned Yo-kai with yellow feminine eyes. Casanono's long, curled hair is dark indigo with a gold heart clipped to the side and at the end of his hair is a large silver ring-piercing. At each wrist is a dark indigo cannon-like section with a light grey, heart-shaped hole on the end. He wears a pale blue shirt with dark, dull blue pants and a gold sash. Around his neck is a short, dull orange scarf.
Being a total polar opposite of Casanuva, Casanono is very meek and not very good with words. He is also very passive when it comes to friends and love interests, but he yearns a lot for someone to love him.
The person inspirited by Casanono will become unpopular and disliked by all.
Befriended: "You'll probably say no, I know, but think we could be friends maybe...?"
Being traded: "Tossed away yet again... You won't be so cruel, will you?"
Receiving food (favourite):"Very good!"
Receiving food (normal):"Eh."
Receiving food (disliked):"Too uncool!"
Freed from Crank-a-kai: "I didn't think anyone would ever get my capsule. Thanks!"
In the anime
Casanono debuts in YW005. Nate is ignored by Katie, and he believes that Casanono was inspiriting him, causing to become obsessed with finding him. Whisper and Jibanyan go out and find Casanono, and he knows who they are. But when asked if he inspirited Nate, he states that he never did, then gives them his ark, asking them to give it to Nate if they see him. After he leaves, Nate catches up with them, still searching for Casanono. Whisper pretends that Casanono is present, so Nate summons Venoct to defeat him. Whisper asks Venoct and Jibanyan to attack the air, and pretend to be hitting Casanono. Whisper throws the ark on the ground, and tells Nate that Casanono has been defeated and dropped his ark. Nate picks up the ark, believing he had just defeated Casanono.
Casanono is a portmanteau of "Casanova" and "No".
His random nicknames are: Loneli, Devin, Nada, and Uncool.
In Yo-kai Watch 3, his Skill is changed from Unpopularity, which makes Yo-kai less likely to befriend you, to Cloud Cover, which prevents him from receiving critical damage.