This is how some of my off the top of my head couples got together and how their relationship is gonna end up. My au, in some other aus they will be different.

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ValGrace: Leo helped Jason cope with breaking up with Piper and then started having feelings for him and then the two got toghether. Drew onc tried to break them apart (Unintentinally, she didn't know they were dating) but they are loyal.

PerNico: Nico and Percy had a similar situation with Leo and Jason (Drew didn't interfear but other girls did) but the main difference was that the 'helping' usually ended up turning into roast battles. They are also loyal.

Karlapity: They were cute until Quackity spent to much time away and Karl forgot about him. They broke up but Sapnap still loved Quackity, but when Karl remembered Quackity again and they could all get together again it was to late and Quackity died.

Fam: Fitz notices Tam more and starts to simp for him, then Tam catches feelings and bam! They a very loyal (but very secert) couple!

Blarion: They had a crush since the moment they met each other. They started out secertly dating, then Hermione found out, and then a domino effect happened. Blaise cheated once but it was more a girl kissed him and then he kicked them. Literally.

Thats all I can think of bye