Killua and Gon basically swap roles as time progresses.

at first, we meet gon, who is literally a ball of sunshine. he’s kind, energetic, and pretty naive about how brutal the world can be. the only reason he even wants to be a hunter is because of his profound optimism.
and , of course, gon meets killua. who is very different in this aspect. he’s been raised to be a cold blooded assassin and acts as so. however, he wants to take the hunter exam purely out of boredom.
at the start, killua, due to his environment, seems to have a “the ends justify the means” kind of mindset, whereas gon tries his best to avoid violence in every situation possible, and these views collide quiet a bit, especially during the exam arc.
we see as time progresses, Killua starts to think more about the necessity of violence, knowing that Gon wouldn’t want his friend to hurt someone. (similar to the situation with Kurapika, only killua is a better listener lmao)
and slowly, Killua starts to show a lot more compassion than before, not only for Gon, but because he feels it is the right way to act. This is shown when he rips out illumis needle, but especially with how he pardoned Ikalgo.
Killua’s actions with Alluka/Nanika, and saving Gon, prove most of all how much he’s developed into one of the most kind hearted people in the show. though that was inside him from the beginning, it took him a lot of development for that to surface.
Killua seems to have become more like the kind of person Gon was from the beginning.

Now, on Gon’s development. As I mentioned before, Gon was incredibly naive at the start, not having ever left the bubble of Whale Island.
as he and Killua went on their many adventures, however, Gon became far more experienced. He watched as his friends Killua and Kurapika did violent things for the sake of their cause, and though at first he didn’t entirely he understand, he starts to see their viewpoints.
After going through new and traumatic experiences, Gon sees how not everything is as white or black as he thought it was. he begins to see how ends /can/ sometimes justify means.
Here’s a big parallel in Gon’s life: Gon asking the phantom troupe how they could kill people who had nothing to do them, and Gon asking Pitou how they could protect someone despite murdering someone who Gon himself was trying to protect.
Gon’s question to both people, though different, is so similar. He is asking how people can have such disregard for other people, how they can only care for themselves.
Why should Komugi deserve Pitou’s protection when Kite got nothing? When Gon wasn’t allowed to try and protect Kite himself? This is where Gon finally puts together the last piece of the puzzle he has been putting together ever since he met Killua.
How can killing be justified? Is it ever okay to sacrifice someone’s life for the sake of justice? and Gon decides here that sometimes it is. He has learned what Killua had known from the beginning, while Killua learned what Gon had known as well.
when Gon and Killua met, Killua had already been put through far more traumatic incidents than Gon. Killua’s family put him in those positions to teach him of this grey morality, and to convince him that sometimes it is okay to kill.
Gon doesn’t experience that type of situation until the end of the series. Meanwhile, Killua had never experienced being loved (correctly, at least) until he met Gon, who already had, and was able to share that love with Killua.
to conclude, Gon and Killua, through their friendship, love, and experiences, introduced the sides of themselves that the other lacked. Gon showed Killua light, and Killua showed darkness. and neither light nor dark is good or bad.
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