for me I really enjoyed Sweetheart from Omori. I also like the square boss from Just Beats and Shapes, the storytelling in that one was so cute. Ahab (Limbus Company) is also really good, though she's kicking my ass right now. Also, also Splatoon bosses always eat, every single one.
i like childe's weekly boss bc of the passive agressiveness and the way he gets jealous and tries to assert dominance by one shotting you when you use the same element as him reply