From The Underworld To The Boiling Isles

AU: When Nico Di Angelo was in "The Jar"(paton pending), the 7 didn't make it in time and he suffocated. He, at first, hung out with Hazel, Reyna, or Will as a Ghost. The 7 blamed themselves for his death. He eventually decided to follow in Bianca's footsteps and try for rebirth. Hazel, Will, and Reyna were sad at first, but all decided that it would be good for Nico to move on. He was granted rebirth and was reborn as Hunter. Will and Reyna(taking Nico's place for TSATS) died in the underworld and also tried for rebirth, being reborn as Luz(Reyna) and Willow(Will). Everything else goes as canon for TOH. (Huntlow/Solangelo + Luz, Vee, and Hunter Noceda siblings + Trans Willow/Will ftm)

All credits to Rick Riordan and Disney for the characters. The only part I own is the plot and AU