Old Monk x OBD
Not quite what you were expecting

Name: Old Monk
Origin: Demon's Souls
Gender: Male/Varies/It's a fucking piece of fabric
Classification: Major Demon/Archdemon
Age: Unknown
Powers and Abilities: Super strength, speed, durability, magic, flight and levitation (only shown as a piece of fabric), energy blasts, possession, summoning, soul manipulation, can also have elemental manipulation (of the fire variety), regeneration (mid-low), invisibility, poison manipulation
Weaknesses: Nothing notable
Destructive Capacity: At least town level+ (superior to the Giants of the Northern Land), likely much higher (its soul was a necessity in increasing the power of the Slayer of Demons to the extent they could contend with False King Allant and later become a Monumental)
Range: Varies with melee, several dozen meters with projectiles
Speed: Supersonic (comparable to the Slayer of Demons, who can react to and dodge Soul Arrows and the arrow traps of the Shrine of Storms)
Durability: At least town level+, likely much higher
Lifting Strength: Varies (dependent on who or what it's possessing)
Striking Strength: Varies (dependent on who or what it's possessing)
Stamina: Superhuman+
Standard Equipment: Monk's Head Collar
Intelligence: Able to manipulate an entire kingdom into its own downfall using the former King of Latria as its current host
Notable Attacks/Techniques:

Notable OBD Victories:

Notable OBD Losses:

Other: