Bonfire of the Damned targets only the player. Creatures with hexproof that player controls will be dealt damage by Bonfire of the Damned if it resolves.

If the player is an illegal target when Bonfire of the Damned tries to resolve, it will be countered and none of its effects will happen. No damage will be dealt to any creature or player.

Preventing some or all of the damage dealt to the player won’t affect the amount of damage dealt to each creature that player controls. The same is true for any effect that increases or decreases the amount of damage dealt to the player.