Lieutenant Commander Shiro Sanada (真田志郎,Sanada Shirō?): the science officer aboard Yamato, Sanada is earnest and dedicated, his ideas frequently saving the ship from destruction. His limbs are bionic, the result of a childhood accident which claimed the life of his sister and left him bitterly resentful of science's arrogance. He was a classmate of Mamoru Kodai, and blames himself for not having repaired the Yukikaze properly before it went into battle. When Susumu Kodai becomes acting captain, Sanada is frequently a source of advice. Sanada is the elder spokesperson for the crew after the deaths of Okita and Engineer Tokugawa.