Spollo

Yusuke's grandfather and also Dr. Head and Zero's academic mentor. He is good at developing various machines including Robopon. However, Spollo has a strong tendency to ignore profitability, and most of SR Corporation's debts are his. Spollo was the first president of SR Corporation at the beginning of the story, but he gave up on being both president and engineer and handed the position over to Yusuke (along with all his debts).

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