Lissandra should get an Arclight Skin

Hell yeah, that would be cool.

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I don't know if Varus/Vayne are evil doers.

Vayne might as well be; I hate her so lol

Vayne's a criminal vigilante. The Arclight skin is basically those who are wrong doing mortals using their power for justice and following a path of light. Varus has fallen to corruption and does have a moral compass when it comes to killing those in the name of justice, where his Arclight skin is where he uses his powers for the good of people while still maintaining virtue in his actions.