From the female characters Barbie herself, played by Margot Robbie is kind of boring, to be honest. She is the kind of perfect blank slate character that goes to do something, but ultimately is there just to meet other, more interesting characters. I mean, she is a dull. Get it? But Ken and Allan where both more interesting dolls. So I don't know. Though the weird Barbie played by Kate McKinnon is a fucking comedy gold. Also an interesting character in the movie is played by America Ferrera who has an interesting plot twist which I'm not going to spoil and a very cool monologue scene. About that monologue scene. I don't think it is only about women's experience. I am a guy and I can totally relate to everything she says there. Maybe it was the point.
For obvious reasons, such as the two main leads Margot Robbie and Brad Pitt and the fact that the movie is about Hollywood and filmmaking, you can compare this film with a Quentin Tarantino picture "Once Upon The Time In Hollywood". But even though Quentin injected a very high amount of energy into his film, with the shier insanity of Babylon, comparing it to "Once Upon The Time In Hollywood" is like comparing RRR and Kubrick's "Barry Lyndon".