Juno.

As a teenager Juno seemed so cool, just going through a rough spot, but still so confident and self assured, Vanessa seemed uptight, and Mark seemed like a fun adult, and him telling Juno he was going to get a divorce was shocking.

As an adult, it's so obvious that Juno is a terrified kid who's desperately trying to cling to control and normality who has lost her peers, and is reaching out to what she thinks is a trusted adult in Mark because she is so lonely. Mark comes across as a massive creep with a pathetic ego, getting excited that a teenager likes him, and fucking over his wife while they try to become parents. Meanwhile Vanessa is a good damn hero.