Itoshi Sae is a person who is busy training himself to become a great soccer player, he is so hardworking that he doesn't eat, sleep, etc.He's selfish, he's very stressed about all of this, what's more, he forgets his own little brother Rin.He also only speaks a little, aka he's quiet, his tone is cold, he doesn't care and he only answers the important parts, which is interesting, isn't it?(blue lock)