Who is the Japanese voice actor for Izou?

The Japanese voice actor for Izou is Yuusei Oda.

What role does Izou have in that anime?

In One Piece, Izou is listed as a supporting character.

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Izou

イゾウ

About

Izou is the commander of the 16th division of the Whitebeard Pirates. His name was revealed in a SBS of Volume 58. He is a cross-dressing man who wears a kimono, and has a make-up complexion and hair tied in a way resembling that of a geisha. (Source: Wikia)