The gun-wielding ninja Shu is a bounty hunter from the city of Indigos with a mysterious past. He is the one who found Elc, then a little kid, in the desert and acted as a mentor to him, helping Elc to become a bounty hunter.  From Wikipedia He is voiced by Shuichi Ikeda

The story follows Elk, a bounty hunter in some strange futuristic world. On this world archaic but advanced technology exists side by side with primitive attitudes, beasts and magic. In other words it's got a bit of everything. It also has an evil conspiracy who are able to produce powerful monsters called chimera, who can also appear as human. Naturally it is not long before Elk has rescued a young female beast-master and gained himself some serious enemies.
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(Source: Anime News Network)

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After a successful 12-year run as a radio personality in the Midwest and New York City, Dave moved to Los Angeles in 1984 to pursue a career in voice acting that has included commercials, film dubbing, looping, narration and voice characterization in countless cartoons. Dave provided the daily intros and voice of Baboo in "Mighty Morphin' Power Rangers" (1993) for Saban Productions and in 2007, was nominated for both Best Actor and Best Actor in a Comedy for the 1st Annual American Anime Awards held in New York City.