Who is the Japanese voice actor for Sam?

The Japanese voice actor for Sam is Hiroshi Yanaka.

What role does Sam have in that anime?

In Arslan Senki, Sam is listed as a supporting character.

Sam appears in several anime, including Arslan Senki, Arslan Senki (TV), Arslan Senki (TV): Fuujin Ranbu.

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One of Pars's Marzban. (Source: Arslan Senki Wikia)

Arslan Senki

Arslan Senki (TV)

Arslan Senki (TV): Fuujin Ranbu

Hiroshi Yanaka

Japanese

Kazuhiko Kishino

Japanese

Jeffrey Schmidt

English

Fabrice Lelyon

French

John Friedmann

German

Alberto Hidalgo

Spanish