Yamazaki Yuu is the professional alias of voice actor Ibuki Tetsuya. Born on February 17 in Kanagawa Prefecture, Japan, he is a male voice actor previously affiliated with the agency RME. His height is 170cm and his blood type is A.

Yamazaki is known for a singular major voice role in anime. He portrayed the character Antkiller in the television anime series Tentai Senshi Sunred. This series aired from 2008 to 2009 and was produced by the animation studio AIC A.S.T.A.. No other major voice roles or recurring collaborations with specific directors, studios, or other voice actors can be confirmed from available information. Similarly, no notable achievements such as awards or nominations are documented for this alias.