Backon; simple clothed, distinguished looking and yet humble, he is the sole reason you're even in this forsaken place. In his simplicity, there lies a certain... honesty? Where does that even come from? Maybe it is so, that he once had a position similar to yours, and through naive hope he positioned himself so that he now plays a certain role. He sounds simple, his language isn't profound, he's quite straightforward. Like he's been here for a very, very long time. His speech has a naturally fast pace, not out of stress, just seems that he's a fast talker. He seems calm and optimistic. Yet quite expressive, always automatically putting emphasis on certain vowels. Like his body is communicating honestly what he feels at the current moment. Everyone could see instantly that Backon really is a proper fellow with tips that are worth listening to.

Also

Dremorah Trueh IX

Daedra of many talents, powerful in essence and detailed in their meticulous plans. Could be useful for the player, if convinced that there's a reason to share their power and knowledge. Similar voice to Backon, persuasive as well but also has a lot of sarcastic undertones, at times openly disdainful of his interlocutors.

Also
Helkan the Dark elf Trader
He is really a blank page. Trader of ambiguous trinkets and odds. Always having something to offer in his shop full of peculiar things.

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Butler of Sir Krenel

Cultured, learned, precise, experienced, always focused on betterment of his craft. Never yielding in front of the task laid before him. Regardless if the task is related to organizing a grand party, where one has to consider the dietary preferences of invited guests, regardless if it's a matter of disciplining his underlings, that still require a proper training to get on an optimal level of servitude. A proud, loyal person, that understands their position within the hierarchy he occupies.

On top of that we could also use that voice template for generic characters if need would arise during development.