Robotack is the eponymous character of Tetsuwan Tantei Robotack. He is a Red Wonder dog-type robot with a dog-type biochip. He came to seek out the Land Tool after arriving in Japan. He also stole Sugi's meal while on the verge of starvation & was soon drafted into the Shardock P.D. Agency in compensation for his consumption of Sugi's meal. His favorite food is sausages, and he ends his sentences with "Bow." When Kakeru plays the Wonder Flute, Robotack performs the Magnet Change & transforms into Special Mode from Base Mode, but he could later transform by himself afterwards.

Arriving in Japan, Robotack had come in search of the Land Tool. Sometime after arrival however, he would suffer starvation, and, after coming across Karo Sugi's meal, would resort to taking the meal for himself as it was the only form of food conveniently present. As a result, he would be drafted into the Shardock P.D. Agency. During the series, new allies would join Robotack's adventures, and by the finale, he would use the complete Land Tool to engage in the final battle. After this, Robotack ultimately died at sea following a fatal sacrifice to win the battle.