Nikumaru is a Japanese manga artist, recognized as the creator behind works such as Bad Girl. A male artist born on May 5, he is based in Hiroshima Prefecture and has been active in the industry since around 2018.

Nikumaru is best known for creating the four-panel manga series Bad Girl. The series began as a guest feature in Houbunsha's Manga Time Kirara Carat magazine in early 2021 before launching as a full serialization in March of that year. The manga has been collected into multiple tankōbon volumes and received a nomination for the Next Manga Awards in the print category in 2022. An anime television series adaptation of Bad Girl, produced by the studio Bridge, has been announced. In addition to this work, Nikumaru has created several other manga series. These include Aitsu no Kanojo, which began serialization in Shogakukan's Sunday Webry in 2022 and concluded in 2025, and Watashi no Onaka no Sekinin Totte!, which ran from 2021 to 2022. He has also contributed short stories such as Kono Mesugaki ni Maketai and illustrations to anthology works.

In terms of artistic identity, Nikumaru is noted for his high productivity, often managing multiple serializations simultaneously while also sharing illustrations on social media. His character designs frequently feature a notable sense of volume, and his work often involves characters with bratty or innocent personalities. He is known to be an associate of fellow manga artist Ken Akamatsu, having participated in events hosted by Akamatsu focused on freedom of expression in 2021 and 2022.