Yūsuke Numata is a Japanese voice actor born on June 10, 1968, in Kanagawa Prefecture. He is affiliated with the talent agency Aoni Production and is also known by the stage name Hiroaki Yamada. His interest in voice acting began during his elementary school years after watching Galaxy Express 999, and he later pursued this career by attending the Broadcasting Arts Academy College and the Seiji Juku Tokyo School. He made his anime debut in 1989 with a role in Dragon Quest.

Numata has built an extensive career with numerous voice roles across anime, tokusatsu, and video games. In the Dragon Ball franchise, he has voiced several characters, including Baby in Dragon Ball GT, Gregory in Dragon Ball Kai, and Quitela in Dragon Ball Super. He also voiced Avo in the special Dragon Ball: Yo! The Return of Son Goku and Friends!!. His work in the One Piece series includes characters such as Chess, Antonio, and Charlotte Mascarpone.

Among his other significant roles, he portrayed Dekao Oyama (Dex Oyama) in MegaMan NT Warrior, Horpun in Futari wa Pretty Cure Max Heart, and Mamoru Iwashima in Konjiki no Gash Bell. His tokusatsu credits include providing the voice for Tac in Mirai Sentai Timeranger and various monster voices in series like Juukou B-Fighter and Tokusou Sentai Dekaranger.

In the specific roles mentioned in the query, Numata provided the voice for Grovel, a servant who was once a frog, in the 2001 animated film Princess Arete. He voiced the character Daisuke in the 2007 television film Miyori in the Sacred Forest. His other roles, as listed, include Bokomon in Digimon Ghost Game, Kōtarō Suwa in World Trigger, Hirō Kijima in Anyamaru Tantei Kiruminzū, and multiple roles across different iterations of Gegege no Kitarō, including Kashabo in the 1990s series and Maruge and Kadou in later versions. He also plays Ryuuboshi in One Piece Log: Fish-Man Island Saga.

His career has involved recurring collaborations with Toei Animation, as many of his major roles are in long-running franchises produced by the studio, such as Dragon Ball, One Piece, and various Super Sentai series. His work in the Dragon Ball series represents a notable long-term collaboration, having voiced multiple distinct characters across different installments over a span of more than 20 years. His notable achievements include a career spanning over three decades since his debut, during which he has maintained steady work in major anime and tokusatsu productions.