Jace: when Jace gets jealous, and it is because of a man who is hitting on you he would walk up to the man, take your hand and kiss you right in front of him, just to tell him to back off and show that you're already someone else his girlfriend. His

Alec: on moments when someone is trying to flirt with you and he notices, he will walk up to the man, take your hand and ask whoever is flirting with you: "is there something you have to say to my girlfriend ?" And if that doesn't help, he'll give the boy his death glare.

Magnus: when someone is trying to get your number or something, he will simply buy them a cocktail which is enchanted for them to get sick. That is if you told them you have a boyfriend, which you always do. He would laugh how they'd run to the bathroom and you'll often laugh too.

Simon: he will only walk up to you, take your hand and kindly whisper for you that maybe you should go somewhere else. He doesn't like to come up to people who want something from you, afraid to start a fight.

Raphael: if someone is being an a$$hole to you, or not stop hitting on you, he will simply tell them to take someone from their own size. And if they don't stop, he'll start being sassy and sarcastic to make them angry. He'll get the whole clan to be his backup if that's what it takes.

Sebastian: he'll walk up to whoever is being a bit weird or uneasy and ask you: "darling, is this man bothering you?" Or he will come up and hold your hand, before he'll simply state: "so I see you have met my girlfriend?"