People talking about Emily needing a fighting style, but couldn't her monster power be a ranged ability? She loves Music so her becoming banshee or an approximation of a Emperor Children Noise Marine could be in the cards
Thinking about it rationally, Emily is supposed to be very compatible with monsters (according to Ella), which usually relates to her being a candidate for infection from the upper monster echelons, like Apostles, Gods, Arbiters etc.
I wouldn't say that the majority of the cast got powers that "suit" their personality. Aside from Deryl, most of the powers are a bit peculiar. For example Michael was compatible with Lightning and eventually Energy, but he is a warrior at heart. Tiffany is cold but he got a very "warm" power that can heal, rejuvenate and recharge. It's possible to draw some parallels, like for example Michael needing to "charge" his power, similar to how he was reliant on bullets and ammunition in general, but the overarching theme seems counter to his personality.
If Emily manages to get a power that suits her hobby, and considering her high compatiblity, I think it would have to do with frequencies in general. I personalliy think that she will end up being compatible with the 7th (Dark) and that's based on Ella not being able to pinpoint the correct monster for her. Dark powers have a lot of suppressing effects, like Valravn's miasma, or how the 7th concealed his aura during deadend3.