Lee Seonho is a voice actor known for their extensive work in the Korean dubbing of numerous anime series and films. Their career is primarily associated with providing Korean-language voices for leading and supporting characters in popular animated titles.

A significant portion of Lee Seonho's career is defined by voicing the character Satoshi, known as Ash Ketchum in some international versions, in the long-running Pokémon franchise. This role spanned multiple series and films, including Pokémon the Movie: Volcanion and the Mechanical Marvel, Mewtwo Strikes Back Evolution, Pokémon Journeys: The Series, Pokémon: Black and White: Rival Destinies, Pokémon the Movie: Hoopa and the Clash of Ages, and Pokémon the Movie: Kyurem VS. The Sword of Justice.

Beyond Pokémon, Lee Seonho's voice acting portfolio includes a wide variety of other anime roles. In the series Lil' Red Riding Hood Cha-Cha, they voiced the character Shiine, a role noted as one of their representative boy character performances. They also took on the role of White Bomb in Bomberman Bidaman Bakugaiden and Chay in the acclaimed OVA Mobile Suit Gundam 0080: War in the Pocket. Another notable role is Hajime Aoyama in the Korean dub of the anime Ghost Stories.

Their other credits further demonstrate the range of characters they have portrayed. These include Krillin in Dragon Ball Z and its film Dragon Ball Z: Resurrection 'F', Tails in Sonic X, Meryl Stryfe in Trigun, Shippo in Inuyasha, and Marie in Nadia: The Secret of Blue Water. Lee Seonho also voiced the character Tomoko Arikura in Dear Brother. The consistency of their work across different series and over time highlights their established presence in the field of Korean anime dubbing.