Yasuaki Takumi is a Japanese actor and voice actor born on October 23, 1982, in Aichi Prefecture. He is affiliated with the talent agency Tokyo Actor's Consumer's Cooperative Society, also known as Haikyō. His path to voice acting was inspired during a hospital stay where he observed children finding joy and courage in anime and special effects heroes, leading him to pursue a career where he could contribute to such experiences.

Takumi began his entertainment career in 2004 and joined the Haikyo Voice Actors Studio as a 28th-term student in 2005, officially joining his current agency in 2006. His early voice work consisted of numerous minor and supporting roles in a wide array of anime television series throughout the late 2000s and early 2010s, including appearances in Bleach, K-On!, Durarara!!, and Kimi ni Todoke. He also provided voices for characters in the tokusatsu genre, notably playing enemy monsters with a Nagoya dialect in two consecutive Super Sentai series, Jyuken Sentai Gekiranger and Engine Sentai Go-onger.

Over the years, Takumi has built an extensive and diverse filmography. He has been a consistent presence in long-running franchises, such as voicing Ace Grit in Bakugan Battle Brawlers: New Vestroia, various characters in the Yu-Gi-Oh! ZEXAL and Yu-Gi-Oh! ARC-V anime, and Matsuda in the High School DxD series. His career progressed to include more prominent and recurring roles, such as Akihiro Altland in Mobile Suit Gundam: Iron-Blooded Orphans, Tsukasa Mizugaki in Plastic Memories, and Edgar C. Blanche in Knight's & Magic. He also voiced the character Wander in the Japanese dub of the Disney animated series Wander Over Yonder.

Takumi has voiced several of the characters listed in the query. He plays George, Duke of Clarence, in Requiem of the Rose King and Shinnosuke Tsuji in World Trigger. He is the voice of the beast master Carrion in That Time I Got Reincarnated as a Slime and Senpai in the Tawawa on Monday net anime and its sequel. He also voiced Daisuke Niimi in Moshidora and Shōtarō Torii in Recently, My Sister Is Unusual. In The Familiar of Zero F, he played Ari, and he voiced Azai Nagamasa across multiple seasons of Ninja Girl & Samurai Master. His role as Takashi Yanase is in the anime film Yūki no Hana ga Hiraku Toku: Yanase Takashi to Anpanman no Monogatari.

In addition to anime, Takumi is active in video game voice acting, with credits including Zero (Alpha) in MapleStory, Zephirin in Final Fantasy XIV: Heavensward, and Shiro in Fire Emblem Fates. On April 9, 2021, he announced his marriage to fellow voice actor Aki Nakajima. His career continues steadily, with ongoing and new roles in series such as the third season of That Time I Got Reincarnated as a Slime, the second season of Sword Art Online Alternative Gun Gale Online, and the 2024 anime Twilight Out of Focus.