Reborn with a second chance: Is it for waste?

All the characters of ROTG, and Brave, Tangled, HTTYD were reborn into a morden time where they attend high school at Guardian High, and they all have no memories of their past life. What happens when they all begin to remember, and they remember the war with Pitch Black and an accomplice that killed them all. No slash! Rated T but it might change to Rated M! ON HIATUS!