I love the demon Vi skin and hope Riot is going to continue it.
Also here's a link to the LoL Forum thread in case you want to support it: https://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/4qcWzEqx-skin-idea-demon-leona
update: added back view and slight changes to the armor.
concepts
final version
slight alternate version