1. Guardians.
Harry has a vision that Voldemort is planning to eliminate key figures of the vampires, werewolves, a wizard faction (smuggle group?), golems, elves, centaurs, phoenix, basilisks (?), spiders, merfolk, griffins, house elves, chimaeras, Azkaban? He sends a message to warn them with Hedwig and the attack fails. A day/couple of days later Harry is visited by the head of the people he saved and informed that they are forever in his debt. Of course Harry, as Harry is, says its nothing but they insist and help him. Maybe form a guardian bond with him? Harry saves more groups from different species and gets 4 guardians or a guard group?
One assigned from the top vampire faction.
One assigned from the werewolf faction.
One assigned from the wizard/smuggle/illegal group.
One assigned from the snake faction (Voldemort trying to kill them because they wont align with them?).
Remus or Sirius as legal guardian? Or Sirius appoints one?