Super Disaster AU Season 1 (Stoneheart - Pharaoh)
Somewhat based on: Bad Plan, Bad Results, please read this to get the first idea and context for the 'origins' episodes.
More or less what if Ladybug was super unlucky with her risky plans or she just suffered consequences more often.
Stoneheart: (Since the original post only talked about the first Orgins parts, here's the second one) When Stoneheart throws Chloe, Ladybug doesn't catch her, leading her to die upon impact. This makes everyone horrified because yes, she was a brat but she was still A CHILD! This angers Chat but he somehow takes his anger out on Hawk Moth instead, vowing to protect this city if Ladybug won't. This makes the town rally to him. Ladybug is hurt but Chat urges her that since she failed Chloe (and him), she could at least help. Ladybug does so. Scene goes as canon (though Chat isn't dependent on Ladybug). The Miraculous Ladybug brings back Chloe and Andre (and Chat, but he has to keep it to himself) is relieved.
Chat doesn't have a crush on her (obviously).
Chloe is traumatized of what happened to her. Marinette (having standards) doesn't change her seat. The umbrella scene still happens. Master Fu is proud of Adrien but is worried if he made the right choice with Marinette.
Most episode rewrites would have Chat working independently and more so taking advantage of Ladybug's lucky charm and miraculous ladybug powers.
Bubbler: Ladybug using her lucky charm for personal reasons is seen by someone. Adrien is exhausted, seeing her arrive at the party. But transforms to save his own party. He cataclysms the bubble much earlier, not wanting to deal with Ladybug.
Pharaoh: Adrien doesn't care about Alya's livestream until Nino (who IS watching) texts him about what's going down at the Lourve does he intervene. The beginning battle goes mostly the same, he even pops the bubble (but because he agrees with her, they need to work together to take down Pharaoh).