Not that ppl care about this AU but I like it a lot still so I'll describe it and try to keep it brief.
My HP delinquent AU is pretty much where Harry decides to run away from the Dursleys and he lives on the street and fends for himself. Ron & Hermione join him because they can't stomach the idea that Harry is on the streets on his own and they'd prefer to give up everything than to be without each other. They find some abandoned train tracks and an empty train cart and turn that into their little home and they have to learn how to fight and take care of themselves to stay safe from people who want to hurt / kill them, and they steal to get the resources they need. Over time they start getting meaner and getting into not great stuff so they're little violent delinquents who carry around a plethora of weapons and sometimes make their own.
On the inside though they're still the same people so when they're on their own they act like their real selves. Harry feels guilty because he never wanted to drag the others down with him but they assure him they all chose this. Living on their own with mostly one another for company things also slowly start developing into a relationship and they don't have the energy to fight it or address it so they just let it be what it is and don't put a label on it
There's a lot of questions / issues with the AU but I mostly find it just fun to put them in situations where they have to act like the bad guys / they're a little less palatable as "good kids". Its just for fun and not really serious but there's a lot of scenarios you can come up with for this
