Hiroki Tōchi is a Japanese actor, voice actor and narrator affiliated with Office Osawa. He has frequently appeared in many anime and video games mainly created by tri-Ace. He won a Male Character Voice Prize in the 2011 Famitsu Awards. Some of his major characters include Abel Nightroad in Trinity Blood, Baldroy in Black Butler, Kokopelli in Bokurano, Tesshin Kataoka in Ace of Diamond, Cross Marian in D.Gray-man, Panther Lily in Fairy Tail, Kugo Ginjo in Bleach and Lasse Aeon in Mobile Suit Gundam 00. In anime film series, he voices Daisuke Akimi in The Garden of Sinners and Dr. Easter in Mardock Scramble. In live-action shows, he provides the Japanese voice for Dean Winchester in Supernatural and its animated adaptation. In video games, he voices the Japanese dub voice for Nathan Drake in Uncharted series, Chris Redfield in Resident Evil and Project X Zone, Aluze in Valkyrie Profile and Desmond Miles in Assassin's Creed. He did Japanese dubbing roles for Wentworth Miller, Sam Worthington, Liev Schreiber, and Will Smith.

Mardock Scramble is a Japanese novel series written by Tow Ubukata. The first novel was published in Japan in May 2003, with the final novel published in July 2003. They were later adapted into a manga series and an anime film trilogy. In North America, Viz Media licensed the novels and published all three in one volume. Kodansha USA published the manga series in English, and Sentai Filmworks released anime films on DVD and Blu-ray Disc.