Age: 15
Nationality: Japanese
Gender: Male
Birthplace: L1 colony cluster
Height: 156 cm
Weight: 15 kg
Eye color: Prussian Blue
Hair color: Dark brown
Mobile suits most used: Gundam Wing/Wing Zero
Mobile suits used: Gundam Wing, Gundam Wing Zero, Mercurius, Vayeate (while still 50% built), Leo, Gundam Heavyarms, Gundam Epyon, Taurus
Heero Yuy. A 15-year-old boy that is codenamed after the assasinated charismatic leader of the colonies. He has been trained to use his Gundam, the Gundam Wing, since he was a little kid. As you can see, being a mobile suit pilot is what he does best. He does everything efficiently and quickly. Everything from disarming nukes to hijacking ships.
Most people that have seen him in action (if they still live) agree that he is by no means human. He has such good control over his body that he can even regain consiousness without changing his brainwaves or pulse. Pain is probably not in Heero's vocabulary. When he escaped from the building with Duo, he landed on the ground (actually land on a slope and tumble down) without a parachute with no pain whatsoever. Not even a limp. He was trained to be a killing machine with no feeling of pain, emotions or mercy.
But if he's such an efficient killing machine, why didn't he just kill Relena right then and there?? She already knows just too much about him, so it's more than a good reason to just go right ahead and pump a bullet right in her head. If he IS an emotionless assasin, why did he almost vomit after realizing that he's almost killed Quatre under the influence of the Wing Zero?? But in reality, below that heartless, cold exterior of his is a good, kind person. It just doesn't show throughout the entire show. And if he only cares about the mission and only the mission, why did he disarm the bombs from request by Sally Po? Simple. His emotions SOMEHOW are reclaiming back his warped, emotionless mind eventually throughout the series.
Heero Yuy, in a nutshell, is a very good person, just he's been trained so good that his emotions are almost non-existent. But being a Gundam pilot ending oppression of the Colonies, you gotta be focused on the mission (I just think Heero's a bit TOO focused, wouldn't you agree?).