The so-called supporting characters usually appear as cannon fodder. It is not the whole human race that sacrifices the ego, but the protagonist.
Once the hero succeeds, thousands of bones will wither, and the supporting characters can only obediently become the stepping stones for the protagonists, who will make you suffer a bad fate.
The supporting character has just managed to get through the exhausting work, and then the protagonist is overtaken by an adventure. After struggling hard, the result is that he gets stuck and becomes cannon fodder.
The so-called protagonist only needs to do three things, upgrade and fight monsters (fight as a supporting character), rescue the beauty as a hero (rescue from the supporting character), and come to the hero (the little brother is also a kind of supporting character, usually they join the protagonist from another supporting character).
The supporting character works hard all his life, but in the end when he meets the protagonist, he is brought back to his original form. Not only is he betrayed by the female younger brother, but he also has to use himself to fulfill the protagonist's needs.
The saddest thing in life is that you think you are the protagonist until you realize that you are the most worthless cannon fodder that no one wants even if you jump off the building and go on sale.
All clay figures have temperaments, not to mention the supporting characters, so the supporting characters also need to be raised and supported.