Mike Wheeler.

Will Byers and Mike Wheeler live in a two-story house in the woods, practically isolated from the living world. They live in a forest that is far from the city, and they don’t even know what is outside the forest, that the place is already native to them. But due to the fact that they both had never seen other people except each other, Will developed a tormenting feeling of loneliness, as well as depression. Will hates Mike because he always humiliated him, beat him up and treated him like trash

Mike is quite cold and strict towards Will, he can lay a hand on him or humiliate him, he never respects him or appreciates him. Because of the feeling of loneliness, Will began to think that Mike was the only one who loved him. He hates him, but still deep down he loves him, for which he hates himself.