The Chosen Undead is the main protagonist of Dark Souls. He/she is sort of an ambiguous character, with the appearance, alignment and equipment entirely decided by the player. He/she is engaged on a quest to either kindle or extinguish the Flame, to end or begin the Age of Darkness.
Powers and Stats:
Tier: At least Low 7-B, likely higher by the end of the game
Name: Unknown; Referred to as the Chosen Undead
Origin: Dark Souls
Classification: Undead Champion, Cursed Warrior
Powers and Abilities: Superhuman Strength, Speed and Durability, Fire Manipulation, Lighting Manipulation, Healing, Shockwave Emission, Magic, Sword Summoning, Magic Empowerement, Poison Creation, Shapeshifting, Semi-Invisibility, Countering, Resurrection (Via Darksign), Teleportation (Via Homeward Bone and Homeward miracle), Regeneration (Via Replenishment miracle)
Attack Potency: At least Small City Level+ (Absorbed the Witch of Izalith, who could unleash that amount of power), likely higher by the end of the game (By defeating Gwyn, the Four Kings, Seath and Nito, the Chosen Undead's power should increase by four times)
Lifting Strength: Class 50+ (Can wield the 27 ton Smough's Hammer with one hand)
Durability: At least Small City Level+, likely higher by the end of the game
Stamina: High; Able to run faster than common undead and fight for extended periods of time while using heavy armor.
Standard Equipment: Darksign, a sword and a shield, anything else that the player may find along the way (such as spears, axes, maces, daggers, whips, bows, crossbows, etc.)
Intelligence: Combat expert with experience fighting a variety of foes with many weapons and spells
Weaknesses: Needs humanity, otherwise becomes hollow