Oh! great is the professional pseudonym of Ito Ōgure, a Japanese manga artist, illustrator, and character designer born on February 22, 1972, in Hyūga, Miyazaki Prefecture, Japan. The pen name itself is a phonetic play on his real name; when his name is written in the traditional Japanese order of family name before given name as Ōgure Ito, its pronunciation closely resembles the English exclamation "Oh great."

Before becoming a professional manga artist, Oh! great worked as a salaryman but accumulated debts playing pachinko. He entered a manga contest primarily for the award money, which led to his professional debut in 1995 with the short story September Kiss, published in the adult magazine Manga Hot Milk by Byakuya-Shobo. His early career involved creating works for adult audiences, including the series Silky Whip, a collection of hentai short stories that became his first work to be published outside Japan.

Oh! great is best known for creating two major long-running manga series. The first, Tenjho Tenge, was serialized in Shueisha's seinen magazine Ultra Jump from 1997 to 2010 and collected into 22 volumes. The story is set in a Tokyo high school where martial arts clubs engage in violent conflicts, and it established his reputation for action-packed narratives. The second, Air Gear, ran in Kodansha's Weekly Shōnen Magazine from 2002 to 2012 and was compiled into 37 volumes. This series focused on extreme inline skating as a form of street warfare and gang rivalry. In 2006, Air Gear earned Oh! great the Kodansha Manga Award in the shōnen category.

Several of his original manga have been adapted into anime. Tenjho Tenge received a 24-episode anime adaptation by Madhouse that aired in 2004, while Air Gear was adapted into a 25-episode series by Toei Animation that broadcast from 2006 to 2007. He is also credited as the original creator for the anime Junk Story - Tetsukuzu Monogatari, which is another title for his adult-oriented work Silky Whip Extreme, a collection of science fiction, erotic, and action short stories published in 1998.

Beyond his original creations, Oh! great has worked on several notable collaborative and adaptation projects. From 2018 to 2023, he illustrated the manga adaptation of Nisio Isin's Bakemonogatari light novel series, serialized in Weekly Shōnen Magazine. He also collaborated with novelist Ōtarō Maijō on the series Biorg Trinity, for which he provided the illustrations. In May 2024, he began serializing a new original manga, Kaijin Fugeki, in Weekly Shōnen Magazine.

Oh! great has also extended his distinctive artistic style to the video game industry. He designed alternate character costumes for several entries in the Tekken series, including Tekken 5, Tekken 6, and Tekken Tag Tournament 2. He also created the guest character Ashlotte for Soulcalibur IV and designed the Eater enemy creatures for Digimon Story: Cyber Sleuth.

The artistic identity of Oh! great is characterized by highly detailed and dynamic artwork, particularly in the depiction of action sequences and the human form. His style often includes violent plots, intricate machinery and backgrounds, and a significant amount of fan service, particularly the portrayal of female characters. This combination of explicit content with compelling, complex narratives has distinguished him from many of his contemporaries. His works frequently explore themes of power, competition, personal growth, and often incorporate flashbacks and extensive backstory to develop the world and characters.