Wil Castillo is an American actor, writer, and producer who has worked extensively in both live-action and voiceover. He began his artistic journey as a child when his mother enrolled him in a drama class to help with a fear of public speaking, which led to a lasting passion for performance. He earned a Bachelor of Fine Arts in Film Production from Loyola Marymount University and also professionally studied acting and directing at the Beverly Hills Playhouse. Beyond his work as a performer, Castillo has worked as an educator, teaching acting, broadcasting, and film and video production classes, and has mentored young filmmakers. He also worked as an Entertainment Department Supervisor at Universal Studios Hollywood and was part of the team that launched the studio's Halloween Horror Nights event.

In the field of anime voice acting, Castillo is known for providing the English voices for several major roles. He plays the character Masanari Tate, who is also the reincarnated warrior Yawaru, in the 1998 anime series Nazca. The series follows a group of people who discover they are reincarnations of ancient Inca warriors. He also voices the character Chada in the series NieA_7. His other voiceover work includes a role in Yamamoto Yoko. No information is available about recurring collaborations with specific directors, production studios, or other voice actors, or about notable achievements such as awards or nominations specifically for his voice acting work.