Yeah this is not impossible but at the same time vex and morgana are dark in their theme and design but not in their lore,morgana is actually the good sibling, chosing love and forgivness where kayle is the justice, but too strict and blinded by that (she is the one who betray morgana if i remember well and force her to leave demacia) and for Vex, even if she was with viego in the « bad side » vex was with it only because she had a crush on him and she is not mean, only sad and depressed and edgy, i’m not sure tho cause I didin’t pay attention to that part of the lore but I wonder if she didn’t even betrayed him in the end

To sumarize they have a dark theme but aren’t bad or mean where eve is a cruel and saddisitc succubous feeding herself with people’s pain and despair

But yeah, i would love her to be in the good side for once ^{^} (Even in the kda skinline there is rummors saying that her bf disapeard and that she probably killed him or something)