For Ogerpon I feel she would like to do some role play sex with one for each of her masks. Ex her hearthflame mask she can role play as like a barbarian and the MC as the captive for fun. Since the loyal three heavily injured her original partner He could have died protecting the mask she can be wearing the wellspring mask since she is still grieving and once the MC beats her she would think its her original partner come back to her since the loyal three also came back to life will then want to stay with him again.
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There's good potential in this idea, I feel like shes adopt the different personalities when she puts the masks on, but she's not as convincing an actor as she thinks she is. Like she keeps stopping and checking to make sure the MC is buying into her act.
Her thinking the MC is her revived partner (or maybe his reincarnation) is so adorably tragic, its going in!
I did have an idea where ogerpon's original partner did want to start a family with her but she wanted to take a walk to think about it and when she got back it was to late and was not able to give her answer to him. So after she killed the loyal three out of rage/sadness she kept pecharunt in its sleep shell form and used it as a golf ball and her cudgel as a golf club to make sure it could not sleep soundly to get some payback. She eventually hit swung to hard and lost it. So when the MC first beats her he could decide to lick the horns on her face (unmasked) and that was something her original partner did so she would think he reincarnated back for her and then gives the answer she was unable to give in time and will follow the MC even without the poke ball.