I think Lina would win whatever side she's on. Her magic is too powerful. But in truth, the circumstances that would lead to them fighting are far fetched. All three are far more likely to befriend each other imo. Especially Maya and Lina bonding over food.
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Who would win in a fight, Maya fey or Lina inverse and Estelle is there (you are the only person on the planet I can ask this question to)