Notes

Danny.
Danny having character and being pretty good at his training by being in a pretty harsh training himself, he having to do hard, suffer with pain his training in order to become good, or great, so they have to train him hard, he was the choosen and it was no other option, after that, he becoming a great warrior because that's what they needed of him. So he being pretty severe with students, give them real discipline to build character, and asking the respect is needed when they're going to train, is not about being chill, is about being good.
Joy.
Joy being way stronger than her brother, smarter, hard worker, resourceful, just better, and also a better person, but that moral is what give her greatness, make her work harder and love her company, so she really care about it, but also being a good person and doing what's right, and still manipulative if she needed to be, you can't be all love and kindness if you want to do great, sometimes rough decisions are needed to take, to be able of accomplish what's needed, like threatening yagami, and actually do it, is just necessary, while his brother on the other side, was weak, with a lack of character, he won't work as hard, and won't accomplish as much, but that also with make him weaker, and able to do less, that's why his father pressure him so much, he doesn't have to do that with Joy, because he's already strong by herself, never needed the discipline, because she could make it work all by herself with her intelligence and will.
Kevin being on life support but before that he could have been an amazing hacker, someone with talent and hard work who's always looking to do best and doing best, just being pretty amazing, even tho he almost died.