Would fit so perfectly ! 
since dawnbringer riven is like an alternate version of her lore wise just like star guardian jinx and project yi/ashe , would be cool to see dawnbringer kayle and especially leona as her mates
same thing for nightbringer skins.
EDIT : Dawnbringer Leona would even more PERFECT SKIN , because her champ select quote is '' The dawn has arrived '' makes relation with the name dawnbringer
Reverse it so we have darkness themed Kayle and Leona but a light themed Diana and Morgana.
Those would be perfect. It's a bit of a stretch, but I would totally back Dawnbringer Nasus and Nightbringer Renekton.
Cool idea but right now Kayle and Morg need visual updates/reworks first.
Leona is the Dawn Bringer if I remember right, and Riot has said they won't release skins to close to the original champ aesthetic anymore. So Most likely none of those will ever happen. Night Bringer Leona/Kayle Dawnbringer Morgana/Diana on the other hand...
If they'd do that, don't expect them to be legendaries, though. They usually don't make multiple legendaries for a thematic.
They won't make them with those names if they make the skins, they are meant to be individualized skins for yasuo and riven. They aren't like the project skins where everyone can have it. Not saying they won't get them, but it's a tough chance.
If they do this with morg or kayle i'd like it to be after they get updated, but i'd love a Leona/diana interpretation. Already fight with name alone and would make a great excuse to have a Solari/Lunari lore event!
Or we could have an actual unique skinline
I'm in love.. RITO PLS ;-; Give us a new cute skin
I agree but I'm just gonna say other champions need skins more.
I feel like it would be redundant, especially with Leo and Diana. Granted they need "opposing" skins, but not those.
