Overlord: Yokai of Nazarick

Ainz Ooal Gown, after conquering the Great Underground Tomb of Nazarick got a gift from the Developer staff, a gift package [Unique Npc] But it wasn't a single Npc they got, a whole new floor with more than just one new Npc. Meanwhile a young man had answered an online question about which Race he would like to be reincarnated as. In the end after answering, he died and became something new, the [Unique Npc]. What will he do in Nazarick? How will his presence change the happenings along the way of Ainz Ooal Gown to World Domination. [Long term story, trying to write so, that people who don't know Overlord can also read it.] [!!!The Light Novel is the basis for this work, not the Anime!!! Thank you for reading and supporting my first work!]