NHF – new heroes for Heroes V 3.1.

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However, the voting speaks for itself. Perhaps we could rework Mirabelle's special ability in the following way: - to make the special ability appealing and prevent the summoned unit from disappearing quickly, it's necessary to make this unit more durable - perhaps with a higher tier (5-6 tier with corresponding parameters). For balance, the numbers in the formula for calculating the summoning of these units can be adjusted. If the units are durable, they will gradually accumulate, and by the late game, this will be a significant force that makes it worthwhile not to recruit units from the castle.
I also like Fiona, but I repeat: "...the voting speaks for itself," and I don't see any other reasons for the dislike of Fiona.

Very often, something that tastes bad is simply difficult to prepare. ;) The voting only determines what needs attention. That is, to make the hero more interesting (or replace them with another). But it doesn't necessarily mean that the hero is actually weak.