Rafael Alonso Naranjo Jr. is a Spanish actor and director of dubbing, recognized for his extensive voice work in animation, live-action series, and films. He was born on April 26, 1960. His voice is described as having a medium pitch, and he remains active in the profession. In the realm of anime, Alonso Naranjo Jr. is known for lending his voice to a variety of characters. He voiced the protagonist Ikki Tenryou, the medal-wrestler partner of Metabee, in the series Medarot Damashii, part of the Medabots franchise. He also took on the role of the wolf beastman Shiro Ogami in the Spanish dub of the Netflix original anime BNA: Brand New Animal, a series for which he also served as voice director. His other anime credits include the character Solaad in The Seven Deadly Sins the Movie: Prisoners of the Sky, Setsuna Kiryu in Kengan Ashura, Theodore "Laurie" Lawrence in the anime adaptation of Little Women, and Aladdin in Aladdin and the Wonderful Lamp. In classic anime cinema, he provided the voice for the titular character in the Spanish dub of the 1960s film Alakazam the Great. He also voiced the character Rafael Masten in the anime series Kickers.

Beyond these roles, Alonso Naranjo Jr. has a prolific career spanning several decades. He is perhaps best known in Spain for being one of the most consistent voice actors for the character Sonic the Hedgehog, having voiced him in various series and films, including Adventures of Sonic the Hedgehog, Sonic X, and Wreck-It Ralph. His work also includes being the habitual Spanish voice for actors Ralph Macchio (as Daniel LaRusso in The Karate Kid films) and Emilio Estévez. His extensive filmography features characters like Syndrome in The Incredibles, Max Goof in the Goofy franchise, Viserys Targaryen in Game of Thrones, and voices in numerous other productions such as Pokémon, South Park, Gargoyles, and Zootopia. He is also involved in dubbing direction and has worked on projects like the series Record of Ragnarok. Alonso Naranjo Jr. is a recognized figure in the Spanish dubbing industry and has been a guest at events like Japan Weekend Madrid and FOCO, where he participates in conferences and signing sessions.