Here is a girl who has Thestrals everywhere - she sleeps with Thestrals, her wand core is Thestrals' tail hair, her boggart is Thestrals, her patron saint is Thestrals, and her Animagus form is also Thestrals.
————————————————————————
Xiao Yin Wan'er originally didn't have a distinction between house blood, but the sorting test changed her. In order to live well, she had to work hard to become a qualified Slytherin; but Wan'er also knew that as long as Lily Evans and Remus Lupine were still in this world, she could not become a desperate Slytherin - after all, a real Slytherin would not be friends with a marrow girl, nor would he fall in love with a hybrid werewolf unknowingly, right? But at the same time, she knew that she could never leave these two people again. Only with these two people could she have the courage to live.
"I cannot and will not give up on any of you. No matter what you say, I will never leave you again." - Xiao Yinwan'er
Purpose: Overcome the devil in your heart