Kirk, Knight of Thorns

Kirk, Knight of Thorns is a character in Dark Souls.

Location
Kirk is an invader that will assault the player three times: first, at the basilisks in the Depths; again at the Demon Ruins at the edge right after the lava produced by the Centipede Demon, and lastly in Lost Izalith next to the Daughter of Chaos.

As with all other black phantoms, Kirk only spawns if the player has reversed his or her hollowing.

Plot
Kirk invades the player in the above-mentioned places, and he has no dialogue whatsoever and does not contribute to the story at all.

Strategy
Kirk's a standard melee fighter. When he rolls, he can also damage and stun the player, so keeping a shield up would make fighting him considerably easier.

Kirk invades at very inconvenient places: in the first and third instances, he's likely to invade while the player already has their hands full fighting others, and in the second, he fights on the edge of a ledge, making it likely for the player to accidentally launch either him or themselves off. Keep these in mind when fighting him and plan accordingly.