Kensho Ono is a Japanese actor, voice actor, and singer born on October 5, 1989, in Fukuoka Prefecture. He is currently affiliated with the agency Animo Produce. Ono began his career in the entertainment industry as a child actor, making his first television appearance in the 2002 taiga drama Toshiie to Matsu. He rose to prominence as the official Japanese dub voice for Harry Potter in the Harry Potter film series, a role he performed for a decade starting from the age of twelve. This long-running role was a pivotal experience that led him to pursue a career as a voice actor. In addition to his voice work, he is also active as a stage actor and launched a singing career in 2014 under the Lantis label.

Ono's career in anime is marked by a wide range of leading and supporting roles. His first major breakthrough role was as the titular protagonist Tetsuya Kuroko in Kuroko's Basketball starting in 2012, a character that became one of his most iconic performances. He has since portrayed a diverse array of characters, including the determined Slaine Troyard in Aldnoah.Zero, the dual-wielding duelist Yuya Sakaki in Yu-Gi-Oh! ARC-V, and the vampire Mikaela Hyakuya in Seraph of the End. A significant milestone was his casting as the fifth JoJo, Giorno Giovanna, in JoJo's Bizarre Adventure: Golden Wind. Other prominent roles from the 2010s include Ryūnosuke Akutagawa in Bungo Stray Dogs, the listless Tanaka in Tanaka-kun is Always Listless, Arata Kaizaki in ReLIFE, and Phichit Chulanont in Yuri!!! on Ice.

The list of roles provided illustrates a career of remarkable breadth and consistent output. In recent years, he has continued to take on prominent characters in popular series. He plays Yuri Briar, the protective brother of the main character, in Spy×Family. He is also the voice of Mahiru Seki in Call of the Night, Sō Hishigata in Summer Time Rendering, and Kei Shinomiya in Tomodachi Game. His repertoire extends to characters in long-running franchises, such as Floch Forster in Attack on Titan The Final Season and Shikadai Nara in Boruto: Naruto Next Generations. He also voices Ukyō Saionji in Dr. Stone and has leading roles in sports anime like Taichi Higashiyama in Love All Play and Taira Nakamura in Aoashi. His film work includes voicing Tomohiro Nagatsuka in the critically acclaimed A Silent Voice and Hathaway Noa in Mobile Suit Gundam Hathaway.

Ono is also involved in music and group performances as part of his voice acting work. He is a member of the seiyuu idol unit from the mixed-media franchise IDOLiSH7, voicing the character Riku Nanase. He has also voiced characters in major video game franchises, such as Diluc Ragnvindr in Genshin Impact.

In recognition of his outstanding performances, Ono received the Best Lead Actor Award at the 16th Annual Seiyu Awards in 2022.