donkey literally fell in love with the dragon, don't tell me this doesn't tie into your thesis
Did he though?
He just used her for personal gains like a tool. He didn't seem to show any real affection or awarness of her pregnancy and kids and the only times she turns up in the movies after Fiona's escape, they're just using her.
Donkey never really expressed anything beyond being an ass except that he could talk. But Donkeys don't really have reputations or apperances so it's not relant to the moral like it was with Shrek and Fiona