>>280785248>I don't remember Heero ever getting any form of development.He learns how to human better later on in the series. He's still the same Heero on the outside but by the end he learns to trust his teammates much more and can even see their strengths better than they themselves can (thinking about Quatre and giving him the Zero System). Also Heero always got along well with Trowa since they first met, they think very similarly and even do the same plan at the same time working independently of each other in the Endless Waltz movie. Also he spends the entire series getting to understand Relena and her perspective, choosing at the last moment to not assassinate her, and then climaxing at the end with him saving her life by sending her away from Libra station, symbolic of him letting go of his own ambition and his original mission to embrace an ideal higher and bigger than himself. ALSO not to mention in the Endless Waltz movie we find out about his tragic past and why he does what he does.