Jace
How he wants to protect you. You're a shadowhunter too you can protect yourself.

Alec
His jealousy. It's like you can't have guy friends or hang out with a boy except him and Jace.

Simon
His clingyness. Sure he's sweet but it sort of annoys you when he doesn't let you go anywhere without him , Clary, Alec, Jace or Izzy.