natasha handcuffing herself to the bed
natasha having visceral reactions to disney movies and old American cartoons
natasha not reacting to the cold because she trained in the snow in shorts and a tank top
natasha hoarding her food
natasha seeing someone not eating for an extended period and fetching them something from the fridge and silently setting it down beside them and walking away before they notice
natasha reciting all the states in alphabetical order when tony jokingly suggests that none of the avengers could do it
natasha always counting everyone after major battles because she’s seen friends die too many times before
natasha having nightmares that she’ll do to her new friends what she was forced to do to the old