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well, in the fifth installment, the elves exploit nature too aggressively – remember how much forest is required to build their cities, whereas in Heroes 4, in the mission for Eruthan, the elves didn't even build a sawmill (wood was supplied once a week, accompanied by a message indicating where it came from), and carrying animal corpses is not a good idea for elves (violating nature – cutting down forests and eating animals – is more suitable for humans and orcs).
Regarding unicorns – it's just an idea (maybe someone will come up with something or even create it), but right now, the most important thing is the female models for the Elven Archers.
And about Wingael – you could remove the deer and put a hood on him, like the one on the archmage, but in green.