I have started re watching the series. To me the most unrealistic is Manami when he is climbing winds come out of his back so I don't think they should do that but again I completely understand the show is for kids and I am ok with that. Midousuji is thirsty for victory so that make him do crazy stuff, I can see people like that on real events. Enjoy the show, keep in mind it is for entertaining only and don't take anything too seriously.