Toshihiko Seki (関 俊彦, Seki Toshihiko, born June 11, 1962) is a Japanese actor, voice actor, singer and narrator. In June 2004, Seki was honored by the readers of Animage Magazine in the 26th Annual Reader's Poll, where he was ranked the 9th favorite voice actor, largely in recognition of his performance as Rau Le Creuset from Mobile Suit Gundam SEED. In August 2007 the Anime News Network called him one of the more prolific male voice actors with 215 roles credited to his name. Seki often voices characters who are very serious or easily agitated like Duo Maxwell in Mobile Suit Gundam Wing, Iruka Umino in Naruto, Kaien Shiba in Bleach and Genjo Sanzo in Saiyuki but he also plays deranged villains like Legato Bluesummers, Rau Le Creuset, Embryo and Muzan Kibutsuji. His most famous role is the Imagin Momotaros from Kamen Rider Den-O, reprising the role numerous productions since then.

[Bio from Wikipedia]

Toshihiko Seki (関 俊彦, Seki Toshihiko, 11 de junio de 1962) es un actor de voz, cantante y actor japonés afiliado a 81 Produce.

关俊彦，日本男性声优。任职于81 Produce。代表作有《柔道英雌》（松田耕作）、《天空战记》（修罗王秋亚人）、《最游记》（玄奘三藏）、《新机动战记高达 W》（迪欧·麦斯威尔）、《机动战士高达SEED》（拉乌·鲁·克鲁泽）、《京极夏彦 巷说百物语》（山冈百介）、《高智能方程式》（布里德加贺）、《忍者乱太郎》（土井老师）、《假面骑士电王》（电王Sword Form、电王Climax Form、桃塔罗斯）、《纷争：太空战士》（光之战士）等多数。

另外也曾配过《神秘博士》、《终极杀阵》、《西洋版七夜怪谈》等外语电视系列剧/电影的日语版。至2008年10为止约有200部作品。