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Fulton is a NPC in Divinity: Original Sin 2.
If you kill him and Audrey, and use Spirit Vision, two Spirits will appear and if you talk to them, you will find out that in fact, they are glad to be set free from this world, and spirits will disappear. No xp for killing though, so feel free to spare them or send them to Hall of Echoes.
The backpack contains the Key of the Exiled Couple. You can also enter Sneak mode and steal the Key from the backpack. It turns out that this Key opens a buried chest you likely will find by chance. The chest is on a stone outcropping near the Harbinger of Doom. The Harbinger is found in the northeast corner of Reaper's Coast. There is no explanation in the game of why these lovers hid this chest in such a remote area. Once you find the chest and return to the Lovers, they do not acknowledge that you took their key or found their chest.
Neither of these folks (audrey and fulton) are worth XP. In a backpack near them you will find the key of the exiled couple. I have no idea what the purpose of the key is though...