Hakase, a five-year-old Welsh Corgi, operates as a core member of the Hills Dogs from their base, Dog Paradise. Serving as the group's primary inventor and technological expert, he possesses an exceptionally high IQ of 200.5. His scientific aptitude drives him to create gadgets and devices that assist the Hills Dogs' missions, offering technological solutions where magic falls short. To fund Dog Paradise, he works as a trader and frequents Akihabara for electronic components, reflecting his interest in cutting-edge technology and otaku culture.

Raised by his mother, a brilliant scientist, Hakase experienced an unusual circumstance shortly after birth: she accidentally rendered herself permanently invisible during an experiment and never reversed the effects, leaving him unaware of her physical appearance. Visually, he sports white and brown fur and consistently wears a white lab coat, glasses, and a blue-green satchel; outside Dog Paradise, he substitutes the satchel for a matching backpack while retaining his glasses.

Personality-wise, Hakase embodies a logical, resourceful problem-solver but occasionally displays mad-scientist traits, prioritizing experiments over other concerns and coercing fellow dogs into tests with detached enthusiasm. This tendency is tempered by his dedication to the Hills Dogs' objectives. His speech features the verbal tic "-shi," appended to sentences to introduce explanations or nuances.

As the group's technology specialist, Hakase maintains professional collaborations, particularly with Seto, whose magical abilities complement his technical innovations. His inventions frequently enable the Hills Dogs to overcome challenges, cementing his indispensable role.