Yūko Gibu is a Japanese voice actress born on January 28, 1981 in Okinawa Prefecture, Japan. She has been active in the entertainment industry since 2004 and currently works as a freelance artist, having previously been affiliated with agencies including AS Planning, Holy Peak, and Genki Project. Over the course of her career, Gibu has performed under several aliases for various projects, including Ryuu Ueto, Homi Momoi, Kokoro Kuroiwa, and Kazuno Kotenjou.

Gibu is known for her extensive work in anime, film, and video games, particularly in the 2000s and 2010s. Her filmography includes a wide range of supporting and recurring roles across many popular series. In the Tamayura franchise, she voiced Maon Sakurada, a shy character who often communicates by whistling, a role she performed in Tamayura - Hitotose, Tamayura - More Aggressive, and related films. Her other notable anime appearances include Akira Okudaira in Sweet Blue Flowers, Yumi Mamiya in MM!, Nozomi Edagawa in Love, Election and Chocolate, Minori Hosaka in AOKANA: Four Rhythm Across the Blue, and Ririko Matsugi in BanG Dream!. Additionally, she played the role of Fumirul in Utawarerumono: Mask of Truth and portrayed Sachiko Kyan in the series Okitsura.

Gibu has a notable history with the Tamagotchi franchise, providing the voice for Chamametchi in Tamagotchi: The Movie and its sequels, as well as playing Patty in Tamagotchi! Yume Kira Dream. Her other voice credits include roles in Encouragement of Climb Season 3, Majin Bone as Momotarō, Koi Koi Seven as Akiwo Suzuka, and Megaman Star Force as Kizamaro Saishoin. She also appeared in Suite PreCure, Go! Princess PreCure, The World God Only Knows, and Anne Happy, among many other titles.

Beyond anime, Gibu has contributed to video games, including her role as Fumiriru in Utawarerumono: Futari no Hakuoro and as Chizuru Onodera in Girl Friend Beta. Her career also encompasses work in drama CDs and even some adult OVA projects. She is recognized as a versatile supporting actress who has built a substantial body of work, particularly known for her roles in slice-of-life, fantasy, and comedy series.