The supposedly cosmopolitan capital of Solitude (well, at least, I got the impression that it's supposed to be cosmopolitan) isn't that cosmopolitan in-game. This mod rectifies it by adding five vendors to the city. They don't have any unique dialogue, but four of them carry advertisements you can buy, which provide a minimum backstory for them.

Meralyn Telendas, a Dunmer, is the wife of the Imperial legate in Winterhold camp. She knows some techniques the Telvanni use in creating their Bug Musk, and sells her own imitation.

Raises-Her-Spirits is an Argonian who sells special wine from the Black Marsh.

They spend their time in the Blue Palace and in the Winking Skeever respectively from 20:00 to 8:00, they walk around the city from 8:00 to 13:00, and they stand in marketplace from 13:00 to 20:00. They will retreat to the Blue Palace when Solitude is under siege during the Civil War.

Khargol gro-Burish is an Orcish dignitary in the Blue Palace. He always stays in the palace and sells Orcish armor.

Antonina Liberia is the Imperial librarian at the Bards College. She sells an assortment of some relatively rare books. Since the College is a big building, she has hired an Argonian assistant, Ruleen-Shei, in order for her bookselling business to be easier to find. They usually stay in the College, though Antonina sometimes takes a stroll in the city.

All the vendors sell their wares from 6:00 to 22:00.