Tack Hat acts as both guardian and tutor to Chikkun Duck, prince of Star R, reporting directly to the planet's king and queen. His core duty is ensuring Chikkun's safety and offering rational guidance during their Earth mission to recover the stolen Waruchin Encyclopedia, a potent reality-altering device. This mission began when Chikkun unexpectedly pursued the thief, Dr. Bell, to Earth, prompting Tack Hat to follow and assume his protective role for their extended stay.

Functionally designed as a robotic top hat, his glossy cherry-red exterior features a distinctive pink bow tied beneath his eyes, resembling a moving mustache when he speaks. His form includes two extendable white metallic arms ending in prim, glove-clad hands for manipulating objects. While typically hovering independently, he occasionally perches atop Chikkun's head to conserve energy, facilitate private communication, or enable the prince to float.

His personality emphasizes practicality, chivalry, and unwavering safety concerns. He exhibits zero tolerance for inappropriate behavior, particularly Dr. Bell's advances toward young women, reacting with visible fluster even to mild provocations like aerobics videos. Despite his mechanical nature, he demonstrates gentlemanly conduct and extends his advisory role beyond Chikkun, offering wisdom to human allies like Miko Nanda and her family.

His capabilities include hovering flight, an internal storage compartment that generates various gadgets and household items seemingly without limit, and functioning as a conventional hat when stationary. Though requiring no sustenance, he actively participates in consuming food and beverages, displaying a noted fondness for tea. His speech remains consistently formal and professional, frequently ending sentences with "-de arimasu" and employing a distinctive "hoho" laugh.