  Arthur is a being from Figurare and Nona/Prima&#039;s ditzy servant. He is also the person responsible for Masaharu&#039;s transformation into a doll in episode one. He normally spends his time in human form while serving as Nona&#039;s butler; when collecting the stardrops, he changes into his dog form, which is presumably a Doberman Pinscher. He cares deeply for Nona, and is concerned with her health when she tirelessly studies to perform powerful spells in order to compete with Sumomo. Beyond his ability to change forms when searching for stardrops, it is not shown he has any other abilities or powers. (Wiki) 

Tsuwabuki is a normal student, though not very social. One day he meets a new transfer student, named Sumomo Akihime, and another girl, both the only members of the gardening club. Tsuwabuki is forced by a teacher to join this club. But then he bumps into a strange guy with dog ears, switching his drink with they guy's by mistake. Drinking it, he is turned in a stuffed animal. The teacher tells him that the only way to turn back to normal is to find the chosen girl and let her catch the seven stardrops. This girl is Sumomo, that accepts to help him, though she's not allowed to know the animal's true identity.
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(Source: Anime News Network)

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Played Hisoka in the Hunter x Hunter musicals.

Arthur Matsuda