Arita is a Japanese professional baseball star playing for a major-league club in New York, and the idol of aspiring pitcher Tomohito Sugino. His mechanics become an unlikely study subject when Korosensei crosses the ocean to learn from them.
Arita is presented simply as a seasoned professional ballplayer, a Japanese athlete who has made his name in the American major leagues. The character is framed by his career and renown rather than by any detailed physical description.
Little is drawn out about Arita's temperament. He is admired from afar by Tomohito Sugino, and the sole glimpse of his character comes through the wry, joking autograph he leaves for Korosensei.
After Sugino fails to land an attempt on Korosensei's life, the teacher flies to New York to take in one of Arita's games. The trip turns out to be research: Korosensei wanted a precise grasp of how Arita's body moved so that he could refine Sugino's pitching. Arita later signs an autograph for him that reads, in mock exasperation, 'Damn you, Tentacles!!'

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Arita is a Japanese professional baseball player on a major-league team based in New York, admired by Tomohito Sugino as his role-model pitcher.
Korosensei watched one of Arita's games to closely study how his body moved on the mound, research meant to help him refine Tomohito Sugino's own pitching form back at Class 3-E.
Tomohito Sugino, an aspiring pitcher in Class 3-E, admires Arita from afar as his baseball idol.
Arita signed an autograph for Korosensei reading, in mock exasperation, Damn you, Tentacles, a joking jab at the tentacled teacher who came to study his pitching.
No, Arita is a minor figure treated as a real professional athlete rather than a detailed character; the wiki gives no physical description of him beyond his career and renown as a major-league pitcher.
Looking for more on Arita? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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