Mister Kaneari is a wealthy and eccentric man who appears as a recurring supporting character in the anime Mysterious Joker. His primary motivation is to protect his treasures from phantom thieves, and he devotes most of his fortune to constructing elaborate traps and security systems designed to capture or eliminate any thief who attempts to steal from him. He is stubborn and persistent in his pursuit of this goal, often going to extreme lengths that include setting lethal mechanisms in his home and workplace.

Personality-wise, Kaneari is notably fixated on a pink teddy bear named Kintaro, to which he is extremely attached. He has a distinctive habit of adding the word indeed to the end of his sentences. He is initially presented as a single man actively seeking a wife, but by the thirtieth episode of the series, he marries his assistant, Kaneko.

In the story, Kaneari serves as one of the many obstacles that the phantom thief Joker and his allies must overcome during their heists. He appears across multiple seasons of the anime, consistently challenging Joker with his maze-like defenses and traps. One notable episode features a train themed around his wealth, called the Luxurious Kaneari Express. Despite his resources and determination, his schemes are always ultimately outwitted by Joker, and his own mansion is sometimes destroyed in the process.

Kaneari is physically described as an adult male with purple eyes and shoulder-length red hair. His abilities are not supernatural; they stem entirely from his vast financial resources and his obsessive dedication to trap-making, allowing him to create elaborate security systems, mechanical traps, and even explosives. He does not undergo significant personal growth over the series, though his marriage to Kaneko marks a notable change in his personal life.