Another one is that we know he doesn't mind reminding us of how good he is.
The Special One has won many trophies during his career so far, including eight league titles and seven major domestic cups.
He hasn't done badly in Europe either.
As well as winning the Champions League on two occasions with Porto and Inter, Mourinho has won the Europa League twicem with Porto and Manchester United.
He even added the Europa Conference League to his haul last season with Roma, completing the ultimate European trophy collection.
It wouldn't be Mourinho without finding a creative way of showcasing his achievement, something the Portuguese boss has done with a brand new tattoo on his right shoulder.
For a man who isn't renowned for his tattoos, the new addition shows that the ex-Chelsea, Manchester United and Tottenham boss is very proud of his achievement.
Mourinho is currently with his Roma side as they step up their pre-season preparations ahead of what he hopes will be another successful campaign.
Roma have already faced Sunderland this month, a match that will be remembered for Mourinho storming onto the pitch and demanding that Luke O'Nien was sent off.
The Sunderland star was booked for a mistimed late challenge on Stephan El Shaarawy, before putting in a number of full-blooded challenges during the first half in Portugal.
Clearly not happy with what he saw, Mourinho made his feelings about O'Nien clear.
Clearly not deterred by the Roma's boss' reaction, the Black Cats' man took to social media make a light-hearted joke about how he might look to stay out of Mourinho's way as he plans a honeymoon with his partner.