Negi Haruba is a Japanese manga artist born on July 27, 1991, in Aichi Prefecture, Japan. He graduated from the manga department of Trident College of Design in 2013. His pen name is derived from the protagonist Negi Springfield of the manga Negima! Magister Negi Magi by Ken Akamatsu, a creator who would later serve as a judge for an award Haruba received. Haruba began his professional career by winning an award in the 89th Weekly Shōnen Magazine Newcomer Manga Award for his one-shot Coward-Cross-World, which was published in Magazine SPECIAL in 2013. The following year, he won a Gold Award for another one-shot, Ura Sekai Communication, in the 21st Dengeki Grand Prize.

Haruba's first serialized work was Karma of Purgatory, which ran in Kodansha's Weekly Shōnen Magazine from 2014 to 2015. For this series, he provided the illustrations for a story written by Shun Hirose. Following several other one-shots, including Vampire Killer in 2016, he created a one-shot titled Go-Tōbun no Hanayome in January 2017. The positive response to this one-shot led to its serialization as The Quintessential Quintuplets, which began in Weekly Shōnen Magazine in August 2017 and concluded in February 2020. The series became a major commercial success, ranking as the fifth best-selling manga in Japan in 2019. It received multiple anime adaptations, including two television anime seasons, The Quintessential Quintuplets and The Quintessential Quintuplets ∬, as well as a special episode, The Quintessential Quintuplets ∽. In May 2019, Haruba won the award for Best Shōnen Manga at the 43rd annual Kodansha Manga Awards for this work.

In February 2021, Haruba launched his next major serialization, Go! Go! Loser Ranger!, also in Weekly Shōnen Magazine. This series marks a departure from romantic comedy into the action genre, focusing on a parody of sentai superhero tropes. It received an anime adaptation produced by Yostar Pictures. Beyond his serialized manga, Haruba also served as the original character designer for the original anime Pon no Michi, which aired in 2024. His body of work demonstrates a range from dramatic narratives about purgatory to popular romance and action-comedy, with a recognizable artistic style in character expressions and visual composition.