Which unit in the Necropolis castle do you like the most in terms of appearance?

Visually, Ghosts are definitely the best for me. Messengers and Liches are also good, but three chained Ghosts, with their incorporeality that you can feel just by looking at them, are a great find that makes you forgive all the minor flaws (vampires with braids and swords, zombies with bellies) of the game's creators.