Halloween's feelings for Tasha, which she claims will last even once the contract's final seal is broken.
Tasha befriending Aria when they first met.
Visul's dedication to Xing is nothing short of this. For all his faults, she was more than willing to follow him wherever he went.
Tasha's mother indeed wants her to come home, so she sent him out to find her. This also has the benefit of stopping him from being taken as a prisoner.
Edea takes care of Tasha after he's been shot and left for dead without asking for anything in return, so he cleans her entire house while she's away.
Linda's family supports Tasha's even after their fall from grace, to the point she's perfectly willing to sacrifice herself to save him. And the moment she got hurt was the moment he Took a Level in Badass.