maybe something you might do if you don't have any shame.
sometimes it's on-line with narcissism as well.
like playing with your nipples in public and forcefully demand money from anyone who sees you.
when someone post your naked picture, instead of being embarrassed, you would sue them of copyright infringement and criticize the picture of lacking artistic value. something half-baked that can't possibly portray your fabulousness.
when someone point out something shameful you outright done recently, you would still put on a straight face, like you're the most dignified person in the whole world.
when you demand everyone to call you senior uncle in your sect, 'cuz you're named the Sect Master's junior brother (can work in modern world as well, look up urban immortal cultivator).
when you wants to accrue benefit, you wouldn't mind the time and place, or how people think of you. like, when you made business deal, you wouldn't even consider the other party's bottom line, and just struck the most profit. if they think you've been too greedy, you would think of it as the most generous deal you could've given them (I'm looking at you, Fang Yuan).
one other example was like, when you want to keep all the milk producing cows to yourself, 'cuz you just damn love milk.
when you confess to your crush in public and got rejected, instead of hanging your head down, you would roast them, saying they had no taste. and kept convincing them until they went out with you. or if anything else fails, you would act like it's such a pity they didn't know diamond from shit and just dashingly walk away.
and many more things.
but the most important thing, shameless protagonist has no word 'shame' in their dictionary. they won't ever feel ashamed, except if they're just acting.
what i like about them, they're always honest with themselves (even if they always lie and scam others) and won't give a damn about bullshit social rules. just do their own thing kind of pal.
well, that's just my subjective opinion, not sure if it would help.