The pilot of the Wing Gundam, the boy known as Heero is the most grim and serious of the Gundam pilots. His true name is unknown, but for this mission of revenge he has been code-named after the martyred leader of the space colonies. Raised by the scientist Doctor J, Heero has been trained since childhood to be a ruthless killing machine, equally proficient in mobile suit piloting, personal combat, demolitions, and computer hacking.

Though Heero's upbringing hasn't yet managed to squeeze all the compassion out of him, he is nonetheless callous towards ally and enemy alike, recklessly careless with his own life and generally a cold-blooded character. Will the friendship of Relena and the other Gundam pilots be enough to warm Heero's cold heart?

Heero's real name is Odin Lowe Jr.  It took me a while to find that out.  Heero is mostly referred to as Heero Yuy.