AU - the First Order emerges earlier and more powerful, overthrows the Republic. 14-16 year old Poe and his father are on the run and end up on Jakku, Poe's father dies. Poe finds lil Finn, abandoned when New Order ship crashed on the planet. Poe raises Finn as an oldersibling/parental figure.
Optional: +Finn's PoV
+if Rey is still abandoned as a child, maybe Poe takes her in too (but then no Finn/Rey or Rey/Poe). Or grown-up Rey shows as a Jedi and the Resistance.
+at one point early on Finn is ill and Poe panics
++Hux is made Jakku's governer (resighned to Antarctica) and at one point has confrontation with Poe, which ends with wounded Poe and teenage Finn taking care of him
++they find battered BB-8 on Jakku
++Resistance shows up, Leia recognises Poe, who was believed to be dead
Gen (Finn/Rey or any) - Poe raises Finn (and Rey) - Jakku AU
Optional:
+Finn's PoV
+if Rey is still abandoned as a child, maybe Poe takes her in too (but then no Finn/Rey or Rey/Poe). Or grown-up Rey shows as a Jedi and the Resistance.
+at one point early on Finn is ill and Poe panics
++Hux is made Jakku's governer (resighned to Antarctica) and at one point has confrontation with Poe, which ends with wounded Poe and teenage Finn taking care of him
++they find battered BB-8 on Jakku
++Resistance shows up, Leia recognises Poe, who was believed to be dead