Kazuya Onemine is a six-year-old character from the *Komi Can't Communicate* series, with a birthday falling between December 31 and February 14. He features brown hair, brown eyes, and a distinctive mole located under his lip, often seen in a blue t-shirt marked with the letter "Y" and dark pants. He belongs to the Onemine family as the brother to oldest sister Nene, older brother Takeru, twin sister Nono, and youngest sister Nana. Kazuya delights in play, especially with his family members. He infuses creativity into tasks and assistance, frequently transforming them into games, reflecting his naturally playful and energetic disposition. His character traits remain consistent across all official media. Kazuya first appears in Chapter 94 of the manga and Episode 22 of the anime adaptation.