I'm just praying the transfer of Mbape to Madrid shouldnt cause any problem among the players at Madrid because Mbape is known for his pride and arrogance,and mark of respect,he might get to Madrid and start feeling that he is more superior to other players in the team.I thank God for Bellingham who is now a candidate for the Ballon D'or,and he might win it.I believe the main reason why Mbape is even moving there is because he wants to win the Ballon'Or,but if he gets to Madrid and doesn't perform the way that he will be eligible,then he will still miss it.
I believe Mbappe will be on good behavior than showing pride in Real Madrid because he'll be meeting other classic players like him who have won Champions League titles more than once. So, there'll be no need to feel superior to other players who have made names and history in Real Madrid.
Every player in Real Madrid knows what they truly want to actualize from Real Madrid ''lifting trophies and winning Ballon d'Or". However, having a bad character of pride would be what Ancelotti would not condone from his team players
But basically Real Madrid is very experienced to gather many star players in its squad, and thus even though Mbappe has arrogance like you said, I think Mbappe and the other players in the Real Madrid squad will be fine. After all, Real Madrid is not like PSG, because even though PSG was able to gather many star players in the squad, in reality PSG still failed in the Champions League. Obviously, these results and factors are very different when comparing Real Madrid with PSG. But regarding Mbappe move to Real Madrid, I personally don't fully say that Mbappe goal is to get the Ballon d'Or because after all, at PSG in fact Mbappe was also nominated but failed. Therefore, playing at Real Madrid is of course to get better achievements in the Champions League and also for better results in his career.