SaintMoon
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No-harem
No, Rias (at least for me) has a horrible and detestable personality, if I could find a way to make her have a different personality from the anime, like her being less "arrogant" I would even give, but there's the second that Lucifer wants to go against it her brother. Akeno, kinda weird he would "date" with his niece, but another one I hate personality.