As the Italian newspaper Repubblica stated, PSG and French international Kylian Mbappé doesn't have any agents as it is his father and his mother (alongside a Parisian law firm) that take care of his interests as of now.
Sponsorship wise, he has a deal with Nike as well as with Hublot (that he only signed after the World Cup). For a player of his level, he is very "free" marketing wise.
When he was younger, Mbappé was a Real Madrid fan and one of his idols is Cristiano Ronaldo. Can Agnelli use the Ronaldo "card" to get Mbappé's interest?
Repubblica hold the view that perhaps as he can also try to help develop Mbappé's brand which isn't very existent as of now. With Dybala who might be eventually sold (Juve would want close to 100 million for him), Mbappé can become an idea for Juve.
Time will tell as we should have more news on the matter soon...