Who is the Japanese voice actor for Luta?

The Japanese voice actor for Luta is Takehito Koyasu.

What role does Luta have in that anime?

In Platinum End, Luta is listed as a supporting character.

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Luta is a second-rank angel. He is one of the thirteen angels and selected Tonma Rodriguez as his god candidate. (Source: Platinum End Wiki)

Platinum End

Platinum End

Takehito Koyasu

Japanese

Christopher Hackney

English

Nicolas Justamon

French

Marcelo Sandryni

Portuguese (BR)

Igor Cruz

Spanish