I know Sleez it thinking about something like this for that character is hard. He was such a disgusting being that even Darkseid thought he was repugnant. I'd say Sleez would be something like a hardcore fujoshi or a shotacon. Just something that would make Milfseid find her disgusting or creepy.
Desaad, which I've thought of for a while desu, would be very infatuated with Milfseid, often trying everything for her mistress to pet her or give her complements.
Also, female Glorious Godfrey would be the best fucking thing ever.