Headcanons
_ He has three sides to his personality; where he is serious and strict (usually happens when things are revolving around official Famiglia business), where he is a kind leader who smiles warmly and openly shows his care to his subordinates (whenever he is around his Family and friends with little Famiglia business are restricting them), and where he's a loving, gentle and patient friend (happens whenever there's absolutely no business restriction between him and those who are dear to him).
Examples:
Personality #1: Episode 178, when the Primo appears before the Tsuna and his Guardians.
Personality #2: KHR Drama Series, "Proof