Paladin Leeroy

Paladin Leeroy is a character in Dark Souls.

Location
Near the end of the catacombs as a white phantom.

Later near the end of the Tomb of the Giants as an invader.

Plot
Paladin Leeroy first appears as a summonable for the Pinwheel boss fight in The Catacombs. His summon sign appears on a ledge that the player has to jump down from the sarcophagus area.

Leeroy later invades the player near the waterfall in the Tomb of the Giants if the player is not hollowed.

Should the player defeat his phantom, they will find Leeroy's armor in Gravelord Nito's chamber after the boss fight with Nito.

Strategy
Leeroy's weapon is large and can hit overhead, so dodging rather than blocking is advised. That said, he spawns on a very narrow ledge, so it may be challenging to not fall off (or have him fall off). It's useful to lure him back to a less limiting battlefield, and finish him off there.

Backstory
Paladin Leeroy is mentioned in item descriptions to be the first undead hailing from the Way of the White. Wielding the treasures Grant and Sanctus, he ventured into Lordran on an unspecified mission. As Grant and Sanctus are both mentioned to have been granted to Leeroy long ago, it can be inferred that he is from a distant era that is able to interact with Lordran's present time thanks to Lordran's disrupted time flow. Little else is known about him, as he has no dialogue whatosever.