Aureliano Castillo, also known as Aureliano Castillo León, is a Mexican voice actor, dubbing director, translator, and theatre artist. As the user indicated, he provides the voice for Jester Galandros in the film Black Clover: Sword of the Wizard King and the character Gawain in the series Magic Maker: How to Make Magic in Another World.

Born in Xalapa, Veracruz, in 1989, Castillo began acting in theatre at the age of nine. His formal training in dubbing started in 2014 under the instruction of Olga Donna-Dío and José Luis Orozco. He holds a bachelor's degree and a master's degree in philosophy from the National Autonomous University of Mexico, where he is also a doctoral candidate.

Within anime voice acting, Castillo has several notable roles. In the long-running series Black Clover, he voices multiple characters including Zagred, Kaiser Granvorka, and Gadjah. His other anime credits include Funakoshi in Junji Ito Maniac: Japanese Tales of the Macabre, Tamotsu Onodera in Kageki Shojo, the Chief Editor in Mars Red, Lorek Kugre in I'm in Love with the Villainess, and a monk in the third season of Castlevania. Beyond anime, his voice work spans live-action series and films, such as playing Kirishima in the 2023 adaptation of Yu Yu Hakusho and Jang-Do in Sabuesos.

In addition to his on-microphone work, Castillo has served as a dubbing director. Notably, he directed the Spanish dubbing for the third and fourth seasons of Black Clover, as well as for the film Black Clover: Sword of the Wizard King. He has also directed dubbing for series such as Ooku: The Inner Chambers and the live-action production The Chosen. His translation and adaptation credits include films such as the 365 Days series on Netflix.