just wondering what kind of questions can we expect for Culture/ Team fit interview rounds at Netflix?
I wouldn't worry about the questions. Instead, be prepared to ask questions about it to help you be comfortable with the culture. The culture part isn't something to 'do well in' but rather something to help you understand if the culture is right for you. If you aren't a good culture fit but 'aced' the culture topics in your interview, you may not last long
Who leads the cultural fit or behavioral interviews at Netflix? Is HR involved?
Usually your panel includes 1 or 2 interviews with talent leadership directly. Technically, all interviews are an opportunity to ask questions and all interviewers will record things like culture fit...especially any red flags.
Be familiar with the culture deck https://jobs.netflix.com/culture