Which unit in the Haven castle do you like the most (based on its appearance)?

I like the unupgraded griffin, archer, and monk. I don't like angels and archangels – in my opinion, the image of an angel from the 3rd part fits the game's atmosphere better.

Wow, I'm now a harpy.

I agree, the image of an angel/archangel is lost in Heroes 5; here, it's completely different, and the units themselves turned out poorly because Nival didn't do a good job with the monsters' faces; they are somewhat expressionless. For example, take the dancing with death; it creates a completely different impression there.