Nichika Omori is a Japanese voice actress born on October 15, 1994, in Nagano Prefecture. As of March 2021, she is affiliated with the talent agency Across Entertainment.

From a young age, Omori was interested in anime, citing Sailor Moon as an early inspiration. She began learning piano at the age of two. During her junior high school years, she studied abroad in Victoria, British Columbia, an experience that solidified her desire to become a voice actor. After returning to Japan, she enrolled in an acting school run by the Pro-Fit talent agency.

Omori made her voice acting debut in 2014, landing her first main role as Yurika Nijino in the anime series Invaders of the Rokujouma!?. In the years following her debut, she continued to secure a variety of main and supporting roles. Some of her early notable performances include Noa Sakura in Pan de Peace!, Chiri Tsukikawa in PriPara, and Chiya Sakagami in Mahou Shoujo Nante Mouiidesukara (Magical Girl Spec-Ops Asuka).

A significant year in her career was 2018, during which she voiced two prominent characters: Asahi Kuga in Seven Senses of the Re'Union and Yurine Hanazono in Dropkick on My Devil!. Her role as Yurine Hanazono became a recurring part, leading her to reprise the character in multiple subsequent seasons and adaptations of the series, including Dropkick on My Devil! Dash, Dropkick on My Devil! X, and Dropkick on My Devil!!: Apocalypse Day. For the first season of Dropkick on My Devil!, she and her co-stars also performed the opening theme song, Ano Ko ni Dropkick.

Omori's filmography spans a wide range of genres and character types. She is known for roles such as Ena Ibarada in the Science Fell in Love, So I Tried to Prove It series, Mira in She Professed Herself Pupil of the Wise Man, Mizuna Tanaka in How Clumsy you are, Miss Ueno, Mokuku in Armor Shop for Ladies & Gentlemen, Rain in Darwin's Game, Juliet "Jobko" Queen Elizabeth VIII in Do It Yourself!!, Higesura in My Isekai Life, Kei Hanabusa in Farewell, My Dear Cramer, Emi Asada in O Maidens in Your Savage Season, Kate in Rainy Cocoa SideG, Kinoto and Okuni Midoriyama in the Battle Spirits franchise, Chacha in Dokyū Hentai HxEros, Chiri Tsukikawa in the Gekijōban PriPara film, Hobsato in Re:Monster, Melpan in Kiratto Pri☆Chan, and the title role in Coluboccoro.

Throughout her career, Omori has demonstrated recurring collaborations with fellow voice actresses, often forming close friendships with her co-stars. This includes work with Aina Suzuki, Masumi Tazawa, and Maria Naganawa on Invaders of the Rokujouma!?. Her work on PriPara led to a lasting friendship with Minami Tanaka and Nanami Yamashita as part of the unit NonSugar. In addition to anime, Omori is also active in video games, lending her voice to characters in titles such as Azur Lane, Girls' Frontline, and A Certain Magical Index: Imaginary Fest. She announced her marriage to music producer Yunomi on October 17, 2023.