Chaos Chao is a  Chao that looks similar to Chaos. It is a supreme being and an evolution that Chao can achieve by giving a normal Chao special materials.
Creating a Chaos Chao is a long process. In order for a Chao to become a Chaos Chao, it needs to have reincarnated (or "transformed", as the game calls it) at least twice. How the player raises the Chao in its previous lives has absolutely no impact on whether or not a Chao can become a Chaos Chao. After a Chao transforms for the second time, the player can give it at least one of every small animal in the game. The player can still feed it fruit, and should do so to keep their Chao happy. If all of the requirements are met, when the Chao evolves, it should come out of the cocoon as a Chaos Chao, as seen in the above picture.
Chaos Chao have many unique traits. They are immortal, never reincarnating nor dying. Chaos Drives and small animals don't affect the appearance of Chaos Chao, though they can still come in different colors. Chaos Chao also cannot mate. Though their behavior remains the same before they transformed, they can no longer change their facial expressions with the exception of falling asleep and having their nap interrupted, and are still able to blink.
Neutral Chao that evolve into Chaos Chao become Light Chao,
Dark Chao that evolve into Chaos Chao become Devil Chao, and Hero Chao that evolve into Chaos Chao become Angel Chao. Chaos Chao have an ominous, organ-like jingle when they transform.
Contrary to popular belief, giving a Chaos Chao drives or extra animals does
not prevent the Chao from becoming a Chaos Chao. This, however, should not be abused, as a Chao must still evolve into a Normal Type. (In other words, the Chao must have used the Animals/Chaos Drives in balanced matter: ten red Chaos Drives, ten purple, etc.)
"Raising a Chaos Chao". . Prima Games. p. 110. Sonic Adventure 2: Battle: Prima's Official Strategy Guide ISBN 978-0761539292.
Main article | Gallery | Beta Elements | Staff | Re-releases ( DX | 2010) Scripts ( Sonic, Tails, Knuckles, Amy, Big, Gamma, Super Sonic)
Sonic ( Super Sonic) | Tails | Knuckles | Amy | E-102 Gamma | Big | Eggman | Chaos ( Chaos 1, Chaos 2, Chaos 4, Chaos 6, Perfect Chaos) | Froggy | Tikal | Pachacamac | Grandma | Metal Sonic* | Cream* | Mr. Know-It-All | Unnamed Sonic robot* | Chao | Flickies | Animals ( Deer, Elephant, Gorilla, Kangaroo, Koala, Lion, Mole, Parrot, Peacock, Penguin, Rabbit, Seal, Sea Otter, Skunk, Swallow)
Beat | Bladed Spinner | Boa Boa | Buyoon | Cart Kiki | Cop Speeder | Egg Keeper | Electro Spinner | Gola | Ice Ball | Kiki | Leon | mechanical fish | Pirate | Rhinotank | Spiky Spinner | Sweeper
Beta ( Mark II) | Gamma | Delta | Epsilon | ZERO | Zeta
Adventure Fields Egg Carrier | Mystic Ruins | Station Square
Chao Gardens Station Square Garden | Mystic Ruins Garden | Egg Carrier Island
Angel Island | Black Market | Chao Stadium | Shrine of Knuckles's race | Tails' Lab
Emerald Coast | Windy Valley | Casinopolis | IceCap | Sky Chase | Twinkle Park | Speed Highway | Red Mountain | Sky Deck | Lost World | Hot Shelter | Sand Hill | Twinkle Circuit | Final Egg
Chaos 0 | Chaos 2 | Chaos 4 | Chaos 6 | E-101 Beta | E-101 Mark II | E-102 Gamma | E-103 Delta | E-104 Epsilon | E-105 Zeta | Egg Carrier | Egg Hornet | Egg Viper | Egg Walker | Knuckles the Echidna | Perfect Chaos | Sonic the Hedgehog | ZERO
Arm Punch | Bolt of lightning | Bomb Attack | Bomb Gun Attack | Charge | Climb | Dig | Double Punch | Earthquake Attack | Electric Arm | Energy Ball Attack | Flame Thrower Attack | Flight Mode | Glide | Guiding Missiles | Hammer Attack | Hammer Jump | Hover | Homing Attack | Instantaneous Liquefaction | Laser Beam Attack | Homing Missile Launch | Homing Tail Slice | Inhale Attack | Jump Attack | Laser Gun | Light Speed Attack | Light Speed Dash | Lure Attack | Marble Attack | Maximum Heat Knuckles Attack | Phantom Shadow Move | Pick | Propeller Flight | Punch | Punch Attack | Quarter Attack | Rapid Tails Attack | Scorpion Attack | Shockwave Attack ( Chaos 6) | Sonic Boom | Spin Attack | Spin Dash | Spin Hammer Attack | Spin Jump | Spinning Spike Attack | Spouting Attack | Squash Roll Attack | Swing Punch | Tails Attack
Level Up Items Ancient Light | Crystal Ring | Fighting Gloves | Jet Anklet | Jet Booster | Laser Blaster | Life Belt | Light Speed Shoes | Long Hammer | Lure | Power Rod | Rhythm Badge | Shovel Claw | Warrior Feather
English voice actors
Ryan Drummond ( | Sonic) Corey Bringas ( | Tails) Michael McGaharn ( | Knuckles) Deem Bristow ( | Eggman) Jennifer Douillard ( | Amy) Jon St. John ( | Big) Elara Distler ( | Tikal, Station Square Train Voice, Default Menu Voice) Steve Broadie ( | Gamma, Pachacamac, Mystic Ruins Train Voice) Tomoko Sasaki (
Japanese voice actors
Jun'ichi Kanemaru ( | Sonic) Kazuki Hayashi ( | Tails) Nobutoshi Kanna ( | Knuckles) Chikao Ōtsuka ( | Eggman) Taeko Kawata ( | Amy) Shun Yashiro ( | Big) Kaori Asō ( | Tikal) Jōji Nakata ( | Gamma) Tōru Ōkawa ( | Pachacamac) Kaho Kōda (Station Square Train Voice) | Nobutoshi Kanna (Mystic Ruins Train Voice) | Elara Distler (Default Menu Voice) | Tomoko Sasaki (
/ Original Soundtrack / Remix / Vocal Mini Album / 20th Anniversary Passion & Pride
Believe In Myself | It Doesn't Matter | Lazy Days | My Sweet Passion | Open Your Heart | Unknown from M.E.
777 Slots Pinball | Air Bubbles | Auto Running | Bumper | Bumper Car | Cannon | Capsule | Card & Pinball | Cart pass | Chao Egg | Chaos Emerald | Chao in Space | Chao Machine | Chao Search* | Conveyor Belt | Corkscrew loop | Crank | Dash Panel | Dash Ring | Debug Mode | Doll | Drum Can | Egg Carrier | Egg Carrier 2 | Emblem | Emerald Radar | Emerald Shard | Employee ID Card | Fan | Flipper | Fountain | Freeze | Goal Balloon | Hanging Bell | Hedgehog Hammer | Helicopter | Hint Box | Icicle | Item Box ( Bomb, Extra Life, Invincibility, Lightning Shield, Power Sneakers, Shield, Super Ring) | Jump Panel | Key Stone ( Gold Statue, Ice Stone, Silver Statue, Wind Stone) | Laser Field Block | Life gauge | Lit Panel | Mirror | Mission Mode | Monkey Detonation Switch | Mystic Ruins | Pinball Shooter | Power cube | Ramp | Ring | Rocket | Sandboard | Satellite | Shrine of Knuckles's race | Shuttle loop | Sky Chase Dragon | Slot Machine | Snowboard | Sonic Token | Station Square | Station Square Police Department | Switch | Teleporter | Tornado | Tornado 2 | Transporter Machine | Trick Jump Panel | Wide Spring | Wind Path | Zip Line
. Sonic Adventure DX: Director's Cut
Main article | Gallery | Beta elements | Staff | Re-releases ( Battle | 2012)
Sonic ( Super Sonic) | Tails | Knuckles | Amy* | Shadow ( Super Shadow) | Rouge | Eggman | Big*^ | Tikal* | Chaos* | Chao ( Dark Chao/ Walker*, Hero Chao, Chao Walker*, Chaos Chao) | Metal Sonic* | Gerald | Maria | President | Secretary | Sigma-Alpha 2 | Animals ( Bat, Bear, Boar, Cheetah, Condor, Dragon, Gorilla, Half Fish, Parrot, Peacock, Penguin, Phoenix, Rabbit, Raccoon, Seal, Sea Otter, Sheep, Skeleton Dog, Skunk, Tiger, Unicorn)
G.U.N troops Blue Eagle | Bomb Beetle | Bomb Wing | Gold Beetle | Gun Beetle | Gun Hawk | Gun Hunter | Gun Wing | Hornet-3 | Hornet-6 | Hornet-9 | Laser Hawk | Laser Hornet | Laser Hunter | Mono Beetle | Phoenix | Rhino Cannon | Rhino Jet | Rhino Metal | Rhino Spike | Shield Hunter | Sky Hawk | Spark Beetle | Spring Beetle
Artificial Chaos ( Artificial Chaos P-1, Artificial Chaos P-100, Cell, Float Type, Guard Type) | Badniks ( Buzz Bomber, Chopper, E-1000, Gola, Unidus, Kiki) | Boo | Boom Boo | Egg Beetle
City Escape** | Wild Canyon** | Prison Lane | Metal Harbor** | Green Forest** | Pumpkin Hill** | Mission Street** | Aquatic Mine | Route 101 | Hidden Base** | Pyramid Cave | Death Chamber | Eternal Engine** | Meteor Herd** | Crazy Gadget | Final Rush** | Iron Gate** | Dry Lagoon** | Sand Ocean** | Radical Highway** | Egg Quarters** | Lost Colony** | Weapons Bed | Security Hall** | White Jungle** | Route 280 | Sky Rail** | Mad Space | Cosmic Wall** | Final Chase** | Cannon's Core | Green Hill
Downtown Race | Grind Race | Planet Quest | Pool Quest | Deck Race | Pyramid Race
Black Market | Central City | Chao Garden ( Dark, Hero, Neutral) | Chao Kindergarten | Chao Stadium | Prison Island | Station Square | Space Colony ARK | Moon
B-3x Hot Shot | Biolizard | Dr. Eggman | Egg Golem | F-6t Big Foot | Finalhazard | King Boom Boo | Knuckles | R-1/A Flying Dog | Rouge | Shadow | Sonic | Tails
Amy Flash* | Black Shield* | Black Wave* | Booming Missile* | Bounce Attack | Captive Light* | Chaos Bind* | Chaos Control | Chaos Impact* | Chaos Screw* | Chaos Spear | Chaos Strike* | Charm Ray* | Crazy Rush* | Crouch | Dark Finish* | Dark Omochao* | Dig | Drill Claw | Drill Drive | Fire Somersault | Glide | Grind Step | Grinding | Hammer Punch* | Heaven's Justice* | Hell Bomber* | Hip Drop* | Hover | Homing Attack | Jump Dash | Kick/Kick Attack | Knuckle Spin* | Laser Missile* | Light Attack | Light Speed Dash | Lock-on | Lock-On Missile | Magic Hands | Omochao | Pick | Power Flash* | Power Laser* | Propeller Punch | Punch (Eggwalker) | Punch/Punch Attack | Rocket Launcher | Rumble Launcher* | Screw Kick | Somersault | Sonic Wind* | Speed Up* | Spin Jump | Spin Dash | Spiral Upper | Storming Heart* | Super Sonic Boost | Swim | Thunder Arrow* | Time Stop* | Volkan Cannon | Wrath of Gaia* | Zap Laser*
Level Up Items Air Necklace | Air Shoes | Ancient Light | Bazooka | Booster | Bounce Bracelet | Flame Ring | Hammer Gloves | Iron Boots | Jet Engine | Large Cannon | Laser Blaster | Light Speed Shoes | Magic Gloves | Mystic Melody | Protective Armor | Shovel Claw | Sunglasses | Treasure Scope
English voice actors
Ryan Drummond ( | Sonic) Connor Bringas ( | Tails) Scott Dreier ( | Knuckles/ GUN Soldiers) Jennifer Douillard ( | Amy Rose) David Humphrey ( | Shadow the Hedgehog) Lani Minella ( | Rouge/ Omochao) Deem Bristow ( | Doctor Eggman) Moriah Angeline ( | Maria Robotnik) Marc Biagi ( | Gerald/ GUN Soldiers) Steve Broadie ( | President) Shelly Fox (Default menu voice) | Jon St. John ( | Big) Elara Distler ( | Tikal) Tomoko Sasaki (
Japanese voice actors
Jun'ichi Kanemaru ( | Sonic) Kazuki Hayashi ( | Tails) Nobutoshi Kanna ( | Knuckles) Taeko Kawata ( | Amy) Kōji Yusa ( | Shadow) Rumi Ochiai ( | Rouge) Chikao Ōtsuka ( | Eggman ) Etsuko Kozakura ( | Omochao) Yuri Shiratori ( | Maria) Kinryū Arimoto ( | President) Shun Yashiro ( | Big) Shelly Fox (Default menu voice) | Tomoko Sasaki (
OST / Vocal Collection / Official / Sampler / 20th Anniversary /
Passion & Pride A Ghost's Pumpkin Soup | Believe In Myself | Deeper | Dive into the Mellow | E.G.G.M.A.N. | Escape from the City | Fly in the Freedom | For True Story | It Doesn't Matter | Kick the Rock! | Live and Learn | My Sweet Passion | Rhythm And Balance | Space Trip Steps | Supporting Me | The Supernatural | Throw It All Away | Unknown from M.E. | Vengeance is Mine
Angel Island | Ancient Ruin | Auto Running | Ball Switch ( Gravity Control Switch, Hourglass, Time Stop Switch) | Bomb | Bungie Vine | Chao Adventure^ | Chao Adventure 2^ | Chao Eggs | Chao in Space | Chao Key | Chao Machine | Chao Transporter^ | Chao World | Chaos Emerald | Chaos Drive | Container ( Cage) | Corkscrew loop | Cyclone | Dash Panel | Dreamcast | Dynamite | Eclipse Cannon | Eggman Bombom | Eggwalker | Emblem | Emerald Radar | Emerald Shard | Fake Emerald | Gerald Robotnik's diary | Goal Ring | Green energy fluid | Grind Rail | GUN Military Truck | High-speed warp tube | Health Gauge | Hi-Speed Shoes | Hint Box | Item Box ( Bomb, Extra Life, Health, Invincibility, Magnetic Barrier, Power Sneakers, Shield, Super Ring) | Kart Race | Key Stone ( Gate Key) | Laser Field Block | Meteorite | Missile | Outfit | Pipe | Project Shadow | Propeller Spring | Pulley | Rank | Ramp | Ring | Rocket | Safe | Shuttle loop | Snowboard | Spinning drum | Swing Bar | Teleporter | Totem Pole | Turtle | Warp Hole | Warp Wall | Weight | Wide Spring | Winding Tunnel
*Appears or is playable only in the 2P mode
**Stage is also playable in 2P mode ^ Dreamcast version of Sonic Adventure 2 only