She's a mentor, a friend, like his mother who always has his back.  In one time raising him. She gave him a box of her old knives and weapons even helped him train.. She's ready to hurt anyone who tears him down..  

-woundedcanary
-bloodycanary

Thad: I'm not your kid!
"You might as well be."

"Unlike my entire family tree I don't plan on it Sara."

"Don't act like you just got here. You too."

"The original black canary."  He says after glancing at his attacker.
Their young selves interacted  once..The events were wiped from their memory which explains why there's a feeling of déjà vu.

Sara:I know ten different ways to kill somebody with this.

Thad: Teach me

"Sara I need help."

"What are you doing?"

"Costume party. Your coming, I snatched something to be your costume. "

Thad: You motherf******

Sara: She's not my type.

Thad: That's not funny!

-A recurring joke she uses constantly. 

Sara: If you look down on yourself one more time I'm knocking you outside your head.

" I called you mom a few times."