Behold; the mighty Jobber King

 

Name: Demon King
Origin: Nanatsu no Taizai
Gender: Male
Classification: Demon
Age: Millions to possibly billions of years old
Powers and Abilities: Super strength, speed, durability, agility, endurance, enhanced senses, immortality (type 1), regeneration (at least mid), skilled hand-to-hand fighter, skilled swordsman, can consume souls, his magic ability The Ruler allows him to invert every and any incoming attack into healing, which also applies to techniques that would weaken him but instead would strengthen him, telekinesis, elemental manipulation (weather, darkness, lightning, nature), possession/reincarnation, telepathy, flight, can use every Commandment which grants him petrification, mind control, power amplification, sound manipulation, age manipulation, can generate shockwaves, can summon other demons to do his bidding
Weaknesses: Holy magic
Destructive Capacity: Small country level+ (superior to Mael) | Small country level+ (can go toe-to-toe with Post-Purgatory Quest Ban and Assualt Mode Meliodas) | Small country level+ (becomes much stronger)
Range: At least several kilometers to several dozen kilometers
Speed: Massively hypersonic+ (far, far faster than Galan regardless of which form, can be seen taking on multiple opponents at once)
Durability: Small country level+, The Ruler and regeneration make him hard to damage let alone kill | Small country level+ (can take hits from Post-Purgatory Quest Ban and Assualt Mode Meliodas), The Ruler and regeneration make him hard to damage let alone kill | Small country level+ (becomes much more durable, could take blows from The One Escanor), The Ruler and regeneration make him hard to damage let alone kill
Lifting Strength: At least Class G+, likely higher
Striking Strength: 
Class ZJ (easily overpowered Meliodas) | Class ZJ (can match Post-Purgatory Quest Ban) | Class ZJ (can match The One Escanor)
Stamina: Vastly superhuman+ (can further supplement his stamina with his numerous abilities)
Standard Equipment: A giant broadsword | A katana
Intelligence: Quite wise and manipulative, albeit he can be a fairly arrogant
Notable Attacks/Techniques:


Notable OBD Victories:

Notable OBD Losses:

Blackbeard (One Piece) - Blackbeard Profile
Kurama (Yu Yu Hakusho) - Kurama Profile
Yhwach (Bleach) - Yhwach Profile


Other:

The Demon King possessing Zeldris

 

The Demon King possessing Meliodas

 

The Demon King with his youth restored

 

Key: Old Form | Possessing Meliodas/Zeldris | Young Form