Oikawa Tooru is a 17 year old kid that plays volleyball that is most likely a virgin, probably never touched alcohol, most likely has no idea how to pay taxes and you call him evil because he works his ass off to become as skilled as he can in order to win against strong people, and, instead of using only his skills in sports, he takes advantage of his tactics and knowing his opponents and knowing what would work against them best, without actually hurting them physically.
You call him evil because he shows all the qualities that he should have as most people his age in high school playing sports should.
You call him evil because he wanted to slap a kid two years his junior in junior high when he himself was nothing more than a brat, and isn’t really that much better now. Hitting someone is by no means alright but it happened when they were in junior high, and though he certainly didn’t grow up too much, he probably gained enough common sense to know that hitting people out of jealousy and brattiness isn’t acceptable and is actually frowned upon.
It seems like a character has to be either evil and full of flaws or good, pure and flawless because otherwise it’s no good.
Oikawa is not a saint, he has some serious personality problems.
But in the end he has lots of qualities that high schoolers have. He’s a brat, yes. But he hasn’t killed or even seriously injuried anyone. He’s not the devil himself, just like he’s not a god. He’s a really real character, and though with some bad aspects to his personality, he’s still working hard to be able to play volleyball that he loves so, so much, because he knows that you can’t depend on only friendship and loyalty and honour and talent to win, but that you also have to depend on logic and tactics and yourself and sometimes luck. And that, as soon as you lose, you’re out of the tournament. He’s still a dependable captain that has lead Aobajousai to many victories, and who helped them evolve as players.
It’s cool to dislike him. It’s cool to hate him. He’s a fictional character. You don’t even need a serious reason to hate or dislike him. You can even dislike him for his hair for all I care. But calling him evil or the worst simply because he wants to win isn’t exactly alright either. Karasuno, Nekoma, Fukurodani, Shiratorizawa, Datekou and all the other teams want to win just like Oikawa does. No one calls them evil for that. Because it’s common sense to want to win when you’re playing sports and one loss means you’re out of the game.
In a sport, if you don’t win, you won’t be remembered. And whether someone wins thanks to sheer talent and through tactics and schemes that, statistically, the opponent should be weak against, doesn’t matter. A win is a win. So long as you don’t injure anyone intentionally, you can, you should do everything you can to win. That doesn’t make any sportsman, Oikawa included, evil.
And that was to the eight freaking Anons that send me the following in various ways, and though none are exactly the same, they all basically sum up to the same thing.