Ichiru Kiryu

Ichiru was a complicated person who was marked by many conflicting emotions and actions. Although he was very close to Zero as a child, Ichiru nevertheless struggled with the inevitability of being left behind by his brother as well as the strain of not being able to make it as a hunter. He eventually became jealous because of how Zero could be healthy and normal while he couldn't. Though professing to both love and hate Zero upon different occasions, Ichiru didn't always appear to know his own mind when it came to his twin, but his actions indicated that in whatever way, Zero was incredibly important to him. The only other person who was just as important to him in his life was Shizuka Hio, but he was heartbroken and angry when she died.