Unnamed Fire Nation lackey accidentally refers to Iroh & Zuko as "prisoners", forcing Azula's hand and resulting in their escape. Iroh & Zuko continue to grow and change as people. (ATLA)
Some rat lets Scott Lang out of the Quantum Realm, causing the inciting incident of Avengers: Endgame. This makes the rat the undisputed MVP of the Avengers saga, don't @ me (MCU)
Random mugger kills the two wealthiest people in Gotham, unknowingly creating the Batman. It is absolutely better for their deaths to be caused by a random mugging that's representative of the rot and crime that pervades Gotham as a whole and leaves no one safe, absolutely @ me I'm prepared to keep explaining (DC Comics)

3 Comments
Redacted@lemmy.zip · 4 pts · 269d
It is not a random mugger. His name was Joe Chill and his motives change wildly with writers
Exusia@lemmy.world · 4 pts · 269d
Bit of the running gag and inverse, but Saitama (the protagonist) repeatedly kicks the shit out of Garou (a future arc antagonist) in One Punch Man. As a result to losing to "random strangers" Garou's growth as a villain is directly influenced by his insecurity about how easily he is beaten. Saitama being the airhead doesn't even recognize him until later.
Impronoucabl@lemmy.world · 1 pts · 266d
The first example is either plot-induced-stupidity, or not a coincidence - but a white lotus operative doing his thing.