Paul Castro Jr. is a Los Angeles-based voice actor known for his work in English dubs of anime, video games, and animated series. His career spans a wide range of characters, from lead roles in feature films to supporting parts in popular franchise installments. In addition to voice acting, he is also active as a writer, producer, and director.

Castro Jr. has portrayed several key characters in prominent anime projects. In the 2021 Mamoru Hosoda film Belle, he voiced the character Kei, also known as The Dragon, in the English language version. He voiced Allegro, a loyal vampire servant, in the 2022 Netflix original anime series Vampire in the Garden. That same year, he took on the role of Marcos in the film Mobile Suit Gundam: Cucuruz Doan's Island. His work also includes the role of Aliquis in the 2023 web series Pokémon: Paldean Winds.

Beyond the roles highlighted, his filmography is extensive and includes work in other major anime and gaming franchises. He has provided voices for characters such as Freminet in Genshin Impact, Opal in Honkai: Star Rail, Rindo Kanade in NEO: The World Ends with You, and Ryota Miyagi in The First Slam Dunk. He has also appeared in series like Record of Ragnarok, High-Rise Invasion, The Seven Deadly Sins: The Four Knights of the Apocalypse, and Go! Go! Loser Ranger!. His casting spans a variety of popular titles, including the English version of the game Fire Emblem Heroes and a role as Monodramon in the Digimon Beatbreak English dub.