On my interview I had a bunch of behavioral questions.. some like : Tell me about a project when ... what’s your leadership style? How you handle stress ? Tell me about your most successful project and why was it successful?
Review sites that have this kind of questions and be prepare for everything! I read a book regarding these questions and how to handle them
For any company behavioral questions, just mapped them to Amazon Leadership Principals. As long as you have an example for each of Amazons leadership principals you can pretty much map every behavioral question a company ask to one of them.
There is no hard rule but the person doing the behavioral is typically the most experience one that will drive the conversation afterwards. It’s really helpful to nail that coding since they typically have the most pull out of all your interviewers.