Hideo Yamane is a minor villain in the fifth season of Arrow. He appears in the flashback timeline and is eliminated by Oliver Queen and Talia al Ghul.
Yamane is a criminal and druglord who operates from Starling City and is responsible for a major part of the drug trade in Starling City. He regularly makes visits to Russia to sell his drugs there as well. After Oliver Queen has proven his worth to Talia al Ghul, she invites him to assist her in taking down Yamane.
The two infiltrate the compound where Yamane is selling a drug shipment to his contact in Russia. They take down Yamane's men and the buyer as well while a terrified Yamane watches in shock. After all his men are done for and Yamane is cornered, he begs the two to spare his life, offering them whatever they want. However, Oliver coldly tells him that Yamane has nothing Oliver would want. When Yamane asks why Oliver is doing this, Oliver replies that he is doing it because Yamane failed Starling City. He then shoots three arrows into Yamane's chest, killing him.
Before appearing in Season 5, Hideo was mentioned on The List in Season 1.