the devil~

The Devil's design for The Cuphead Show! remains more or less the same, with only a few stylistic changes made. In addition to now always shown as having a tail, his nose has gained a red flush along with having longer yellow horns instead of white horns, and the red irises he is only occasionally depicted with in-game are now a permanent part of his design. His fur is softer and less scruffy and has also gained a slight blue tint. Two more notable differences from his in-game counterpart are that he shows a bit of fat and his ears are a bit longer and spikier.

While the Devil is essentially naked, not counting his fur, he is briefly seen wearing various outfits and accessories in the show, most notably during the third season. His primary outfit consists of a white tailcoat with a matching top hat, white spats, and a red bow tie, that he wears during his song in "Carn-Evil" and during the dance battle against Ms. Chalice in "The Devil and Ms. Chalice". Clothed or not, he goes barefoot throughout the episodes, except for his outfits during his performance in the Underworld and later his audition in "Cupstaged" where he wears a blue and purple prince-like theater costume and pink ensemble with a black top hat and high-heeled boots respectively. In "Sweater Off Dead", he's briefly seen wearing a party hat. In "Release the Demons!", he briefly appears having apparently just gotten out of the shower, draped in two pink towels, one around his body (and held up to his chest) and one around his head (or, more accurately, his horns). In "Roadkill", when mistaken as a stray cat by Elder Kettle, he's briefly seen wearing a pink bow on his head. As shown in "A Very Devil Christmas", his winterwear consists only of a striped red scarf. At the end of the same episode, he wears a train conductor costume when he plays with his toy train.

The Devil is manipulative, evil, flamboyant, and has an obsession with collecting souls. He is more jolly and playful than he is in the game, and behaves in a more sassy and childish manner. In "Carn-Evil", he gleefully sings about how great it is to be him, how he adores being a naughty bully to the Isles' locals, and that collecting the inhabitants' souls is his favourite hobby. He also shows a sarcastic side after seeing Cuphead play Soul-Ball without losing the game and his soul, calling him a show-off. Through this, it is also implied that he has a hatred for exhibitionists in general. However, he can be very intimidating as seen in "Roll the Dice" when he threatens King Dice after his failure. In the third season finale, the Devil proves just how nightmarish he can be when he kills Ms. Chalice in a disturbingly graphic way as a show of intimidation before resurrecting her. His temper is violent and (literally) explosive, able to easily level the entire carnival without even really trying to and capable of letting off a huge explosion of fire that levels an entire stretch of forest, but he tends to calm down or get distracted as fast as he gets angry, just in time for something else to make him mad. Another example of his rage is shown in "Release the Demons!", where he accidentally (and casually) kills several of his demons during his tantrums about how Cuphead irritates him alone, showing his terrifying amount of power. In the second season, the Devil’s hatred of Cuphead becomes more intense, to the point where just talking about him is enough for him to have explosive bursts of anger. He also becomes more bad-tempered and wrathful in general, including towards other demons such as Henchman and Stickler.
At the same time, the Devil is rather comically conceited. He is incredibly prideful of himself, believing he'll always win and get what he wants in the end. This pride is what leads to his failures in both the game and the show. In "Sweater Off Dead",

Old Scratch
Mr. S
The Big D
King of the Underworld
Lord of Darkness
Boss (by Henchman and King Dice)
Sir (by his minions)
Mrs. Meow Meow (by Elder Kettle)
Hairy Boy (by Santa Claus)
Old Guy (by Ms. Chalice)
Lord of Dance (by King Dice)

Ruler of the Underworld
Collector of souls
Founder and Owner of the Carnevil (formerly)
Founder and Owner of The Devil's Casino

Using his pitchfork as a gun that shoots flames
Shape-shifting
Teleportation
Bursting into flames when frustrated or at will
Levitation
Telekinesis
Levitating people with his pitchfork
Taking people's souls from their bodies

Teleportation: Using his pitchfork, he can transport himself to a location of his choosing in a cloud of smoke. He is also able to teleport objects and people with a snap of his fingers.
Levitation/Flight: He can lift himself off the ground and fly.
Telekinesis: He can move people and objects without touching them.
Shapeshifting: Like in the game, he can transform into other creatures, such as a goat, octopus-like monster, a giant serpent, and even Quadratus himself. Sweater Off Dead proves that this power can go haywire when the Devil is extremely angry.
Pyrokinesis: He can produce and control fire, usually when angered. He can even force it to become more intense with effort, like when he's trying to get Cuphead to take off an invisible sweater. The flames are hot enough to set an entire city ablaze and turn the strongest demons into piles of ash. The fire he produces usually explodes on contact.
Thermal Resistance: The Devil can withstand being surrounded by flames and high temperatures without any damage on his body. However, while his fur seems effective against heat coming from a specific direction, as shown in "The Devil's Revenge!", he has a limit under extremely high temperatures, but the fireball explosive was only hit on his belly, which has immense scales without any fur, showing that in The Devil's serpent form, it may be only his scales that are limited to fire.

Thermal Resistance: The Devil can withstand being surrounded by flames and high temperatures without any damage on his body. However, while his fur seems effective against heat coming from a specific direction, as shown in "The Devil's Revenge!", he has a limit under extremely high temperatures, but the fireball explosive was only hit on his belly, which has immense scales without any fur, showing that in The Devil's serpent form, it may be only his scales that are limited to fire.
Soul Stealing: He can remove people's souls with his bare hands.
Contract Bestowal:

Anger issues: The Devil's temper often gets the better of him. As of Season 2, he has been trying to learn to control his emotions, with little success as he is seen ripping up the pages of a book, "Controlling Your Rage", destroying his favourite teacup after his hallucination about Cuphead and burning his finest demons alive in Episode 8, Release The Demons!. Although in Season 3, he seems to be less angry than in the previous seasons, having less anger issues, but he still teases others aggressively in a rude manner.
His pitchfork: He is not immune to attacks from his own weapon, seen when Cuphead repeatedly electrocutes The Devil with his pitchfork when the latter tries to retrieve it. Additionally, half his powers are tied to his pitchfork, and he cannot teleport or shoot fire whenever he is deprived of it. However, he may have accidentally mistaken this, as seen he doesn't need his pitchfork to shoot fire since he can still use fire in his rage form, and he still has Telekinesis. He can even still levitate and fly without his pitchfork, and transform, or even grow into a giant. Coincidentally, as seen in Carn Evil, he is shown to actually teleport without his pitchfork, as seen in an in-mirror "flashback" while singing his song.
Bureaucracy: Even a being as powerful as The Devil is not above rules and regulations, as Stickler reminds him he has exceeded the time limit for acquiring Cuphead's soul. However if Cuphead signed the soul contract, this owes the devil his soul again.

Soul theft
Blackmail
Mass murder
Pollution
Destruction of property
Stalking
Abuse of power
Death threats
Terrorism
Slavery
Deforestation
Malefic
Mass starvation
War crimes
Kidnapping
Arson
Torture
Sabotage
Fraud
Animal cruelty
Unlawful imprisonment

Soul removal
Shapeshifting
Levitation
High intelligence
Trickery
Manipulation
Charisma
Deception
Conjuration
Animation
Absolute immortality
Telekinesis
Intimidation
Leadership
Musical skills
Dancing skills
Painting skills
Cooking skills (implied)
With his pitchfork:
Teleportation
Pyrokinesis
Pitchfork proficiency
Several other unspecified abilities

winning every games
he secretly likes you but since he is the devil he doesn't know how to show feelings he kind of lets you off with your mistakes when he should be punishing you