Well at least for me Lapis is a damage character with a lot of trauma, but she cares for Natori and wants to protect her, considering giving her up because she feels she still needs revenge for the sake of her dead sister(?).
On the contrary Diana is in love because Natori treated her well and made her feel hope and wanted. She is a teenager its normal her love is about how she feels not about the other person, which she still can't even call Natori by her real name. She is selfish in how she feels treating Natori like an object to be fight upon, without giving her the dignity to ask how she feels about it. She is in love with the idea of Natori not really her as a person, and is also selfish with her teammates and others for her personal desires.
Diana looks like a good character with a chance to grow but now is no it. She needs a redemption and maturity arc and could possibly be pair with a teammate, maybe when she recognises Natori as a person and not a projection of her own desire for love. Of course Lapis needs therapy and PTSD help, maybe it will be when she sees the damage taking revenge will cause to Natori hurting her the most, or she will really become the villainess.
All that is to say I really want Lapis to step on me.
