Yeah it's pretty important to conveying interpersonal reletionships in Japanese.

Surname = more formal
Given name = more friendly

Honorific = more formal, less affectionate
No honorific = [i]very[/i] affectionate, all but reserved for family only

And obviously there's the minefield of knowing whether to call a gang-girl "-chan" or not, because some will be flattered but others will take it as fightin' words, like you're calling them small and frail or something 😬 lmao