Yahiro Samukawa

Yahiro Samukawa is a supporting protagonist in the anime series Guilty Crown. He is a student at Tennozu High School, a member of the Motion Picture Research Club and a classmate of Shu Ouma. He is also secretly a drug dealer named 'Sugar', who deals a drug called Normagene in order to secure treatment for his brother, who got infected by the Apocalypse Virus.

He is voiced by Takahiro Mizushima in the Japanese version and Dave Trosko in the English version.

Appearance
Yahiro is a tall young man in his late teens, with straight dark brown hair that stops over his eyes and dark brown eyes. He is usually seen wearing the Tennozu High School uniform, though he is seen wearing other outfits on occasion as well.

Personality
On the surface, Yahiro appears to have an outgoing and sociable personality. Shu describes him as someone who takes the time to think about the people around him, which is more than he can say for himself. However, this is soon revealed to be an act he puts to hide his anger, with him claiming that he acts like a nice guy because that's what people expect from him and because he's "harmless," resulting in him acting like someone he's not. When he returns to school after selling Shu out, he drops the facade for good.

Due to his highly cynical nature, Yahiro is willing to resort to morally questionable and even ruthless actions to achieve his goals, the least of which is his dealing in the drug Normagene, which he does in order to secure treatment for his infected younger brother Jun. It's for this very same reason that he sells out Shu to GHQ after he had promised to keep his secret. He refuses to feel remorse for any of these actions, saying he can't apologise for the world they live in.

Despite showing protective instinct towards Jun, Yahiro's Void (which manifests as a pair of shears that can take a person's life) reflects that he secretly views his brother as a burden to him, saying he was always in the way. It gets to the point where Jun asks Shu to mercy-kill him, saying he doesn't want to end up hating his brother. However, considering Yahiro's reaction to his brother's death, as well as the fact that Voids reflect people's inner fears and complexes, it's likely that Yahiro isn't at all proud of this trait.