Felix comes across as very unapproachable, threatening Charlotte and complaining about being looked after from their first interaction. Once in the party, he mellows out slightly, letting Charlotte through Puppeteer doors and occasionally cracking snarky jokes. He regards her positively, but condescendingly, occasionally commenting on her lack of ability compared to his. Despite his front of superiority, he cares about Charlotte deeply and seems to want to win the affections of his uncle.

(copied from wiki)