Kaido

Kaido is a notorious pirate, considered the strongest creature alive, unbeatable in one-on-one fights across land, sea, and air. He started as an apprentice on the Rocks Pirates ship with Big Mom and Whitebeard, gained fame for his suicidal recklessness after the crew disbanded, notably defeating Gecko Moriah. He conquered Wano with Orochimaru, formed alliances like with Donquixote Doflamingo for artificial Devil Fruits to build a Zoan-user crew of over 20,000, allied with Big Mom, and became a target in Luffy and Law’s plot against the Emperors. Kaido is suicidal, views compassion as weakness, yet shows honor, tanks attacks when drunk and one-shots foes when unthreatened, and fights all-out when sober against equals.
Strength
- One-shots a distracted Oden 20 years ago (source) (20 years ago)
- Law and Doflamingo acknowledge Kaido would obliterate the Doflamingo Pirates if offended (source)
- A single swing of his club sends an underling crashing through a wall and over the horizon (source)
- A clash against Big Mom splits the sky with their impact (source)
- One-shots Luffy in Gear 4, intentionally hitting just hard enough to leave him breathing (source)
- Defeats all 8 Red Scabbards 8v1 (source)
- Utilizes a haki-infused swing to smash through Kin’emon’s swords and put him on death’s door (source)
Durability
- Gets heavily wounded by a direct hit from Oden 20 years ago (source) (20 years ago)
- Entirely unharmed by an impact that shakes an island and capsizes a nearby moored battleship (source)
- Suffers no damage from a barrage of Gear 4 Luffy going all-out without defending (source)
- Possesses the stamina to fight Big Mom throughout the night (source)
- Takes several superficial wounds from haki-infused sneak attacks by the 9 Red Scabbards while heavily inebriated, but is perfectly fine save a slightly burnt scar immediately after defeating them (source)
- Takes a heavy attack to the face from Luffy after Luffy upgrades his Haki to internally assault enemies, but gets right back up (source)
- Practically no-sells a combined attack from Zoro and Killer (source)
- Transforms into beast form and is perfectly fine after tanking a combo attack from Luffy, Law, and Kidd (source)
Speed
- Scales to being fast enough to blitz Gear 4 Luffy (source)
- Thunder Bagua tags Luffy even when Luffy is reading the future (source)
Devil Fruit - Uo Uo no Mi, Model: Seiryu
- Exhales a fiery Blast Breath capable of obliterating an entire castle and part of a mountaintop in a single hit (source) (Blast Breath)
- Blast Breath aimed at the ground leaves a large swath of destruction (source) (Blast Breath)
- Demolition Gust turns breath into invisible air slashes (source) (Demolition Gust)
- Summons several tornados around himself with Dragon Twister (source) (Dragon Twister)
- Summons a twister about himself and blasts off numerous air slash projectiles with Dragon Twister Demolition Breath (source) (Dragon Twister Demolition Breath)
- Roars turn into lightning capable of splitting the ground with Lightning Roar (source) (Lightning Roar)
- Can lift up entire islands with his flight clouds (source) (Flight)
- Tanks a direct hit to the top of the head from Luffy in Gear 3 while insanely drunk with no visible damage (source)
- Immediately after the head hit, tanks a barrage of similar blows to his entire body and simply reverts to human form showing no injury (source)
- Takes a chain of attacks from the 9 Red Scabbards, successfully slamming one through a rock formation in retaliation (source)
- Tanks his own Blast Breath being wrapped around his body and returned to him (source)
- Survives several of the Red Scabbards group-focusing an attack on his old scar from Oden, claiming they can’t properly open it up (source)
- Tanks another round of combo attacks from Luffy, Law, and Kidd, including a radiation attack near his heart (source)
- Notably uncomfortable after a sonic attack targeting his internals (source)
- Pushed away by Luffy’s Rhino Schneider drop kick attack (source)
- Luffy going all out with a Kong Gatling attack and then punching him down into the ground puts Kaido on the ground for a few moments (source)
- Zoro manages to cut through his scales by effectively utilizing Enma, Oden’s blade (source)
Hybrid Form
- A combo attack with Big Mom, Conquest of the Sea, throws out a huge air-wave attack that obliterates an enormous area and cripples Zoro who tried to block it, destroying 20-30 of Zoro’s bones (source) (Conquest of the Sea)
- An overhead slam, Conqueror of the Three Worlds - Ragnarok, twirls his club and jumps high up, bringing it down with full might, completely KOing Luffy (source) (Conqueror of the Three Worlds - Ragnarok)
- Heavily injures Luffy with a swing of his club (source)
- Can shoot a breath blast at-will (source)
- Slightly injured by a point-blank Injection Shot from Law (source)
- Zoro going all out and using his strongest attack barely wounds Kaido, but the attack will leave a scar (source)
- Uses Thunder Bagua to hit both Law and Zoro (source)
- KOs Luffy after Luffy learned to utilize Supreme King Haki in his blows (source)
Haki
- So potent in Haki that Devil Fruit powers such as Law’s teleportation are nullified (source)
- Can sense the voices of all 5 Supernovas he’s facing, confirming advanced Observation Haki (source)
- Can infuse strikes with Supreme King Haki, clashes several times with Luffy using it and takes several blows of his (source)
- Clashes Haki with his daughter Yamato (source)