"He was already dead when he got here. Really. Seriously. Honest."
Hailing from South America, Yamma came to work in Japan after fleeing government officials in his home country. Just why he was fleeing government officials is unknown, and nobody really cares. He hasn't made any significant contributions to the DAPC, but Seras admits that he's a hard worker when the science team actually has work to do, and values the man as an assistant.