Yamma served as the forward for Team Sledge Mamma and acted as its leader. He is regarded as one of the league's most formidable pilots, instilling fierce intimidation in his opponents. An ill-tempered man willing to employ underhanded methods, he is also proficient in knife fighting. It is later revealed that Yamma harbors a dislike for Takeshi due to his similarities to Cunningham. Yamma is also shown to be the oldest pilot in IG-1, second only to Andrei during his brief return while Amy was sidelined with an injury. Subsequently, after losing to Team White Snow, he is dismissed from the team. In the original pilot microseries, he was African-American.
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