Mbappé is just starting to play in Madrid. His ego was very high at PSG. Sometimes he acted as if he had an ego above the team. Although, it was not his fault here, the team president gave him this opportunity. They turned a blind eye to everything so that he would not leave the team, but he still left the team, and for free. I don't know if Real Madrid will show the same ego, but for now everything is very good.
Real Madrid is the biggest and most successful club in the world and Kylian Mbappe is very much aware of that so you don't expect him to bring whatever sort of arrogance he was exhibiting in Paris Saint Germaine to the club. Real Madrid is bigger than any player in that current squad and can as well do without a any player in the current squad. Kylian Mbappe came to the club to win trophies and I'm very confident that he'll concentrate in giving his best to the club instead of trying to be worshipped and adored by the club management.