Nichika Ōmori is a Japanese voice actress born on October 15, 1994, in Nagano Prefecture, Japan. She began her career in the industry in 2014 and is currently affiliated with the talent agency Across Entertainment, having transferred there on March 1, 2021, from her previous agency Link Plan.

Ōmori made her debut as a voice actress in 2014 with her first major role as Yurika Nijino in the anime series Invaders of the Rokujyōma!?. Over the years, she has built a substantial portfolio of anime voice work. One of her early roles was as Coela Viper in the 2015 series Sky Wizards Academy. In 2016, she voiced Noa Sakura in Pan de Peace! and began her long-running role as Chiri Tsukikawa in the PriPara franchise, a character she would reprise in the theatrical film Gekijōban PriPara: Mi~nna de Kagayake! Kirarin Star Live. She also lent her voice to the character Chiya Sakagami in both the 2016 series Mahou Shoujo Nante Mouiidesukara. and its second season.

Her career continued to gain momentum in 2018. She voiced Asahi Kuga in Seven Senses of the Reunion, a role that brought her wider recognition. That same year, she began her notable recurring role as Yurine Hanazono in the comedy series Dropkick on My Devil!. She has portrayed this character across multiple installments, including Dropkick on My Devil!, Dropkick on My Devil! X, Dropkick on My Devil!! Dash, and Dropkick on My Devil!!: Apocalypse Day. Also in 2018, she voiced Mizuna Tanaka in How Clumsy you are, Miss Ueno, and the character Mokuku in the short-form series Armor Shop for Ladies & Gentlemen.

In 2019, Ōmori played the role of Kate in Rainy Cocoa SideG. The following year, she voiced Ena Ibarada in the romantic comedy science anime Science Fell in Love, So I Tried to Prove It, and provided the voice for Rain in the survival action series Darwin's Game. In 2021, she was cast as Kei Hanabusa in the soccer-centric anime Farewell, My Dear Cramer.

One of her significant leading roles is Mira in the 2022 fantasy anime series She Professed Herself Pupil of the Wise Man. Later in 2022, she voiced Juliet Queen Elizabeth VIII in the original anime series Do It Yourself!!, and played the part of Higesura in My Isekai Life. She contributed to the long-running Kiratto Pri☆Chan franchise as the character Melpan beginning in 2020.

Her more recent roles include Hobsato in the 2024 series Re:Monster, Scooped Up by an S-Rank Adventurer! as Ryouen, and the character Chacha in both Dokyū Hentai HxEros and SUPER HXEROES: HEROES SAVE THE WORLD. Looking ahead, Ōmori is scheduled to appear as Kurosuke in the upcoming historical anime series Inherit the Winds, which is set to premiere in January 2027.