I liked the idea of him not wanting to be the hero, not a real fan of the killing the "comrades" but still has possibilities. To me it looks like it is a combo of let's do a different take on the hero summoning and a parody making fun of some of the tropes (one of the party exposes herself then gets mad when he sees and attacks him with a sword, this one always drives me crazy). For those who say he is supposed to be the hero, he points out in chapter 1 that he didn't call himself the hero, it was the king who summoned him and the king apparently said his job was to save the world from the demon king, not oh show us the way to being really, really nice people. He killed the demon king and obviously from his statement fully expected and believed that to be fulfillment of his deal.
Later, admittedly after having his buttons pushed, the king states you are the possession of this kingdom. We learn that a knight did not keep his word to the MC. I did love the statement by the MC, after some action, "do you swear on your two balls." The main character references that even without the demon king the nation has multiple problems with an implication one of them is the dumpling king. Finally we've got a group that never made themselves known until after ten years of violence. Then they are upset because he didn't become the person they wanted him to be, didn't come to understand that their views are correct unlike his. Course it's not completely his fault because he should have failed and been defeated by the demon king according to the professor. So please after years of more violence please try to reflect on what a proper life is.
I did love that in one panel he throws his pencil and it is embedded in one of the nobles forehead, not killing him, and then several pages it is still there. They need to keep it there in later meetings.