Medvedev and Novak have similar personalities, they can be a bit arrogant, a bit condescending.
I dunno about this.
Medvedev is just a general asshole, despite that he doesn't seem to think he is one. He's also quite the narcissist. He's insulted line judges, ball kids, the crowd, had a dq for apparent racist remarks and tried his best to intimidate both players and umpires in the past.
He's not squeaky clean, no matter how he tries to portray himself.
If we ignore his idiotic and ignorant views, when Djokovic first burst onto the scene, he was a likeable guy. Very humble, like Nadal.
Somewhere around 2013-14, he morphed into this character with supreme arrogance and an obsession with being the greatest seemed to completely devour his former laid back character.
Around then is when he became very unlikeable to me.
What makes Nadal such a great role model is that nothing about him has changed. He is still just as humble and grounded as he was at the start of his career.
Whether that is because he has always had a step in the door of retirement, and will continue to be there, I'm not sure.
It does always seem like Rafa is just grateful to be playing tennis for another year though, as if he's always expecting his career to end at any given moment.