The ratmen in warhammer are quite unique, indeed, and we hope to see the rattiest and scurriest of performances in this audition slot. Natty Buboe is a legendary marksman of clan Mors and is said to be able to snipe the head off of someone's body from 7000 paces afar. Skaven are very twitchy in nature and have a tendency to follow up certain words in sentences with synonyms of that word. Please refer to the references provided for an accurate image as those can do the description much more justice than we can.
For Natty we envision a sly and insidious delivery, but being skaven we are eager to see any and all takes on the iconic skaven.

Reference: https://www.youtube.com/watch?v=1MROg_LdKYc&t=467s