I love yaoi mangas where the uke is very beautiful, kind, and nurturing, and the seme is strong, tough and stoic. I guess like opposites? But they're very loving towards each other?

Like in the manga 'Neo Arcadia - Yami Ni Saku Niji', and Kakei and Saiga from 'Gohou Drug'? I can't think of any other examples right now.

Like a light/dark pairing. Or angel/demon kind of thing.

Does anyone know of other mangas with the same kind of pairing?

Royal Fiancé
Joukakei Kareshi (Omegaverse)
Yuuwaku no Hitsuji
Hatsujou Animal
Kowarekake no Omocha
Houkago no Love Call (Opposites)
Golden Eyes (sorta)
Mr. Secret Floor
Shinnyuu Kinshi no Koi
Desert Moon (sorta)
Teiou no Amai Wana

Look up, "foreign seme" and usually the uke and seme are what you described