The author has succeeded at writing a pretty interesting character. She's pretty funny in a natural feeling way, not like a comedian but someone whose personality just makes you smile, in a small way.
Her manager seems like a jerk so hopefully she's a good agent to tolerate all the teasing unless they were good friends before
I feel like they have a pretty good chemistry. Sasa is a blunt person herself, so possibly she appreciates an agent like that, instead of some slippery person with a forked tongue. If it was an overly serious agent, they might get along, but there would be no inspiration there.