Atchmon's gruff, down-to-earth nature reminded her of a certain apple farming mare she was quite fond of; and if not for that analogue, Rarity couldn't say she would've become such good friends with the noble-savage human. He won her heart and her trust all on his own, and without sacrificing much of who he is. He was stubborn to change, yet still willing to better himself by listening and following Rarity's advice. 