Second Evolution

After your Chao emerges from its first evolution cocoon, it is considered to be an adult. However, its shape and colour are not permanent and will continue to change as it grows older! This is called second evolution, and will continue throughout its adult life. Unlike the first evolution, the Chao does not enter a cocoon for the second evolution.

An adult Chao can change into a total of nine different possible second evolutions: Normal, Swim, Fly, Run, Power, Swim+Run, Swim+Power, Fly+Run, and Fly+Power. However, the second evolutions are completely different for each of the fifteen first evolutions. This means there are a total of 135 different complete second evolutions!

It works just like it does with a child Chao: the Chao will gradually change over time depending on the animals or Chaos Drives that it interacts with. At first, you will find it very difficult to tell what ability type(s) the Chao has for its second evolution, as there will be very little difference. However, the effect will become increasingly more pronounced as it grows older, and will be in full effect after twelve to twenty hours. A rough guideline is the change should be apparent after the Chao's first (natural) mating season.

Contrary to popular belief, second evolution is not permanent, has nothing to do with stats, and does not take place at any specific age. You can always change the second evolution of a Chao by simply giving it different animals or Chaos Drives. For example, if you have a Neutral/Fly/Run Chao, you can give it Power animals and it will change into a Neutral/Fly/Power Chao.

There have been a lot of questions about the format used on Chao Island to describe evolutions. Basically, the format is Alignment / First Evolution / Second Evolution. This format can also be seen as Alignment / Ability Type / Gradual Evolution. For example, "Dark/Run/Power" is a shorthand way of saying that a Chao has the Dark alignment, Run first evolution, and Power second (gradual) evolution.

In reality, there is nothing special about second evolution. It is almost exactly the same as the gradual change that a child Chao goes through before it evolves, with only a few differences: it is a longer, slower process;there is no longer any control over alignment, as that is fixed after first evolution; and it ends with the Chao's death, not with a metamorphosis.


Here you can view images of all the second evolutions. There are quite a lot, so you may want to use the below options to filter them!

Neutral/Normal Evolutions

Before After Second Evolution Nickname Description
Neutral/Normal Neutral/Normal/Normal Neutral/Normal/Normal None Very normal...
Neutral/Normal Neutral/Normal/Swim Neutral/Normal/Swim None This Chao is exactly like a Neutral/Normal/Normal Chao, except the tip of its head goes up and starts to curl.
Neutral/Normal Neutral/Normal/Fly Neutral/Normal/Fly None This Chao is exactly like a Neutral/Normal/Normal Chao, except the tip of its head curls forward.
Neutral/Normal Neutral/Normal/Run Neutral/Normal/Run None This Chao is exactly like a Neutral/Normal/Normal Chao, except the tip of its head goes straight back.
Neutral/Normal Neutral/Normal/Power Neutral/Normal/Power None This Chao is exactly like a Neutral/Normal/Normal Chao, except the tip of its head goes up.
Neutral/Normal Neutral/Normal/Swim+Run Neutral/Normal/Swim+Run None
Neutral/Normal Neutral/Normal/Swim+Power Neutral/Normal/Swim+Power None
Neutral/Normal Neutral/Normal/Fly+Run Neutral/Normal/Fly+Run None
Neutral/Normal Neutral/Normal/Fly+Power Neutral/Normal/Fly+Power None

Neutral/Swim Evolutions

Before After Second Evolution Nickname Description
Neutral/Swim Neutral/Swim/Normal Neutral/Swim/Normal None Slightly taller than the Neutral/Swim Chao, and has larger ears.
Neutral/Swim Neutral/Swim/Swim Neutral/Swim/Swim None Light blue highlights, and the head is more rounded with longer ears.
Neutral/Swim Neutral/Swim/Fly Neutral/Swim/Fly None A quite thin Chao, with lots of colours.
Neutral/Swim Neutral/Swim/Run Neutral/Swim/Run None A small Chao with many coloured markings, mostly consisting of green and aqua.
Neutral/Swim Neutral/Swim/Power Neutral/Swim/Power Sumo Chao Very fat, has a very large stomach that sticks out.
Neutral/Swim Neutral/Swim/Swim+Run Neutral/Swim/Swim+Run None
Neutral/Swim Neutral/Swim/Swim+Power Neutral/Swim/Swim+Power None
Neutral/Swim Neutral/Swim/Fly+Run Neutral/Swim/Fly+Run None
Neutral/Swim Neutral/Swim/Fly+Power Neutral/Swim/Fly+Power None

Neutral/Fly Evolutions

Before After Second Evolution Nickname Description
Neutral/Fly Neutral/Fly/Normal Neutral/Fly/Normal None The wings turn orange and the jesters straighten back behind the Chao's head.
Neutral/Fly Neutral/Fly/Swim Neutral/Fly/Swim None Feet become flatter, and the head becomes more spread out, as if to protect it.
Neutral/Fly Neutral/Fly/Fly Neutral/Fly/Fly (Advanced) NiGHTS Chao Longer jesters and larger, brighter wings. Resembles NiGHTS a lot more than the Neutral/Fly.
Neutral/Fly Neutral/Fly/Run Neutral/Fly/Run None The jesters curl backwards and the Chao becomes a more mellow pink.
Neutral/Fly Neutral/Fly/Power Neutral/Fly/Power None The Chao's jesters grow upwards and curve like a scorpion's tail, and the Chao becomes much redder.
Neutral/Fly Neutral/Fly/Swim+Run Neutral/Fly/Swim+Run None
Neutral/Fly Neutral/Fly/Swim+Power Neutral/Fly/Swim+Power None
Neutral/Fly Neutral/Fly/Fly+Run Neutral/Fly/Fly+Run None
Neutral/Fly Neutral/Fly/Fly+Power Neutral/Fly/Fly+Power None

Neutral/Run Evolutions

Before After Second Evolution Nickname Description
Neutral/Run Neutral/Run/Normal Neutral/Run/Normal None A brighter blue colour and is just like the Neutral/Run Chao in shape, except with straighter spikes.
Neutral/Run Neutral/Run/Swim Neutral/Run/Swim None The Chao's feet become long and pointy and turn an aqua colour. Spikes become more joined.
Neutral/Run Neutral/Run/Fly Neutral/Run/Fly Elf Chao Turns a weaker purple and its feet and spikes curl up.
Neutral/Run Neutral/Run/Run Neutral/Run/Run (Advanced) Sonic Chao This Chao is a rich blue colour and resembles Sonic.
Neutral/Run Neutral/Run/Power Neutral/Run/Power None Has a cone shaped head with a red stripy top, and stripy hands.
Neutral/Run Neutral/Run/Swim+Run Neutral/Run/Swim+Run None
Neutral/Run Neutral/Run/Swim+Power Neutral/Run/Swim+Power None
Neutral/Run Neutral/Run/Fly+Run Neutral/Run/Fly+Run None
Neutral/Run Neutral/Run/Fly+Power Neutral/Run/Fly+Power None

Neutral/Power Evolutions

Before After Second Evolution Nickname Description
Neutral/Power Neutral/Power/Normal Neutral/Power/Normal None Just like the Neutral/Power Chao, except this Chao's head is more rounded.
Neutral/Power Neutral/Power/Swim Neutral/Power/Swim None Its ears and feet have purple markings and its stomach and feet are quite chubby.
Neutral/Power Neutral/Power/Fly Neutral/Power/Fly None Head is like a volcano, and fists are similar to those of Knuckles. Stripes are on its feet and ears.
Neutral/Power Neutral/Power/Run Neutral/Power/Run None Ears look like antenna, and go straight up. Hands and feet have orangy yellow markings.
Neutral/Power Neutral/Power/Power Neutral/Power/Power None Big and red. Huge bulky body, hands, feet and head. Looks powerful.
Neutral/Power Neutral/Power/Swim+Run Neutral/Power/Swim+Run None
Neutral/Power Neutral/Power/Swim+Power Neutral/Power/Swim+Power None
Neutral/Power Neutral/Power/Fly+Run Neutral/Power/Fly+Run None
Neutral/Power Neutral/Power/Fly+Power Neutral/Power/Fly+Power None

Hero/Normal Evolutions

Before After Second Evolution Nickname Description
Hero/Normal Hero/Normal/Normal Hero/Normal/Normal None A general Hero Chao.
Hero/Normal Hero/Normal/Swim Hero/Normal/Swim None Has cyan colour markings and has bunny ear like things on its head.
Hero/Normal Hero/Normal/Fly Hero/Normal/Fly None Has weaker purple markings with two ball like things on its head.
Hero/Normal Hero/Normal/Run Hero/Normal/Run None Has a mixture of bright and dull blue markings, with two sharp needle like things extending from its head.
Hero/Normal Hero/Normal/Power Hero/Normal/Power None This Chao has dark blue markings with some pink strips. Has two ball like things on its head.
Hero/Normal Hero/Normal/Swim+Run Hero/Normal/Swim+Run None
Hero/Normal Hero/Normal/Swim+Power Hero/Normal/Swim+Power None
Hero/Normal Hero/Normal/Fly+Run Hero/Normal/Fly+Run None
Hero/Normal Hero/Normal/Fly+Power Hero/Normal/Fly+Power None

Hero/Swim Evolutions

Before After Second Evolution Nickname Description
Hero/Swim Hero/Swim/Normal Hero/Swim/Normal None Like the Hero/Swim Chao, with a different range of colours.
Hero/Swim Hero/Swim/Swim Hero/Swim/Swim None Vivid colours with long petal like things extending down its head.
Hero/Swim Hero/Swim/Fly Hero/Swim/Fly None Curvy head pieces with green and yellow markings.
Hero/Swim Hero/Swim/Run Hero/Swim/Run None Many blue shades make up this Chao. Has two long head pieces extending down its head.
Hero/Swim Hero/Swim/Power Hero/Swim/Power None This Chao is also quite fat, with two large ears.
Hero/Swim Hero/Swim/Swim+Run Hero/Swim/Swim+Run None
Hero/Swim Hero/Swim/Swim+Power Hero/Swim/Swim+Power None
Hero/Swim Hero/Swim/Fly+Run Hero/Swim/Fly+Run None
Hero/Swim Hero/Swim/Fly+Power Hero/Swim/Fly+Power None

Hero/Fly Evolutions

Before After Second Evolution Nickname Description
Hero/Fly Hero/Fly/Normal Hero/Fly/Normal None Similar to the Hero/Fly Chao.
Hero/Fly Hero/Fly/Swim Hero/Fly/Swim None This Chao has jagged like things on its head, and has blue purple markings.
Hero/Fly Hero/Fly/Fly Hero/Fly/Fly None Four long, stringy hair like things extend from this Chao's head. Has purple markings.
Hero/Fly Hero/Fly/Run Hero/Fly/Run None Purple markings and has two petal like things coming from its head.
Hero/Fly Hero/Fly/Power Hero/Fly/Power None Two long straight things coming up from the Chao's head. Mainly uses purple colours.
Hero/Fly Hero/Fly/Swim+Run Hero/Fly/Swim+Run None
Hero/Fly Hero/Fly/Swim+Power Hero/Fly/Swim+Power None
Hero/Fly Hero/Fly/Fly+Run Hero/Fly/Fly+Run None
Hero/Fly Hero/Fly/Fly+Power Hero/Fly/Fly+Power None

Hero/Run Evolutions

Before After Second Evolution Nickname Description
Hero/Run Hero/Run/Normal Hero/Run/Normal None A long spike like thing is on the top of this Chao's head. Has blue markings and stripy blue hands.
Hero/Run Hero/Run/Swim Hero/Run/Swim None Lots of stripes on its hands and top of its head. Two petal like things extend off the top of the Chao.
Hero/Run Hero/Run/Fly Hero/Run/Fly None Purple markings and blue wings, with a shaped object from its head.
Hero/Run Hero/Run/Run Hero/Run/Run None Light blue markings and its head splits into three petal like things.
Hero/Run Hero/Run/Power Hero/Run/Power None Has weaker purple markings. Its head has a long thing with a ball on the end.
Hero/Run Hero/Run/Swim+Run Hero/Run/Swim+Run None
Hero/Run Hero/Run/Swim+Power Hero/Run/Swim+Power None
Hero/Run Hero/Run/Fly+Run Hero/Run/Fly+Run None
Hero/Run Hero/Run/Fly+Power Hero/Run/Fly+Power None

Hero/Power Evolutions

Before After Second Evolution Nickname Description
Hero/Power Hero/Power/Normal Hero/Power/Normal None Just like the Hero/Power Chao except is slightly bigger.
Hero/Power Hero/Power/Swim Hero/Power/Swim None Slightly chubby Chao with pink markings, and has shaped head pieces.
Hero/Power Hero/Power/Fly Hero/Power/Fly None Purple markings and has head pieces that look like petals.
Hero/Power Hero/Power/Run Hero/Power/Run None This Chao has mellow pink/peach markings and has a rose like head piece.
Hero/Power Hero/Power/Power Hero/Power/Power None This Chao has lots of red markings and is quite big. It has three large things extending from its head.
Hero/Power Hero/Power/Swim+Run Hero/Power/Swim+Run None
Hero/Power Hero/Power/Swim+Power Hero/Power/Swim+Power None
Hero/Power Hero/Power/Fly+Run Hero/Power/Fly+Run None
Hero/Power Hero/Power/Fly+Power Hero/Power/Fly+Power None

Dark/Normal Evolutions

Before After Second Evolution Nickname Description
Dark/Normal Dark/Normal/Normal Dark/Normal/Normal None A general Dark Chao.
Dark/Normal Dark/Normal/Swim Dark/Normal/Swim None Like a normal Dark Chao except the back of its head curves down and its markings are peachy.
Dark/Normal Dark/Normal/Fly Dark/Normal/Fly None Is exactly like a normal Dark Chao except has a sharper spike on its head and purpler colour markings.
Dark/Normal Dark/Normal/Run Dark/Normal/Run None Very purple with a slight larger spike on the back of its head.
Dark/Normal Dark/Normal/Power Dark/Normal/Power None Is exactly like a normal Dark Chao except has an oranger tint and a longer head.
Dark/Normal Dark/Normal/Swim+Run Dark/Normal/Swim+Run None
Dark/Normal Dark/Normal/Swim+Power Dark/Normal/Swim+Power None
Dark/Normal Dark/Normal/Fly+Run Dark/Normal/Fly+Run None
Dark/Normal Dark/Normal/Fly+Power Dark/Normal/Fly+Power None

Dark/Swim Evolutions

Before After Second Evolution Nickname Description
Dark/Swim Dark/Swim/Normal Dark/Swim/Normal None Almost exactly like the Dark/Swim Chao, but has a longer spike behind its head.
Dark/Swim Dark/Swim/Swim Dark/Swim/Swim None Has the same colours of the Dark/Swim Chao and has small yellow wings.
Dark/Swim Dark/Swim/Fly Dark/Swim/Fly None This Chao is coloured blue and black, with a weird spike coming out of its head.
Dark/Swim Dark/Swim/Run Dark/Swim/Run None This Chao has a spike coming from the back of its head, and has aqua coloured markings.
Dark/Swim Dark/Swim/Power Dark/Swim/Power None A chubby chao that is made up of many shades of greens. Also has three spikes on top of its head.
Dark/Swim Dark/Swim/Swim+Run Dark/Swim/Swim+Run None
Dark/Swim Dark/Swim/Swim+Power Dark/Swim/Swim+Power None
Dark/Swim Dark/Swim/Fly+Run Dark/Swim/Fly+Run None
Dark/Swim Dark/Swim/Fly+Power Dark/Swim/Fly+Power None

Dark/Fly Evolutions

Before After Second Evolution Nickname Description
Dark/Fly Dark/Fly/Normal Dark/Fly/Normal (Advanced) Reala Chao Just like the Dark/Fly Chao except with longer jesters.
Dark/Fly Dark/Fly/Swim Dark/Fly/Swim None The Chao's jesters grow and droop by the side of the Chao's head. The tips of its feet and hands are a light blue.
Dark/Fly Dark/Fly/Fly Dark/Fly/Fly None The jesters grow and become slightly jagged. Also becomes slightly darker.
Dark/Fly Dark/Fly/Run Dark/Fly/Run None Has light purple markings and the jesters morph into balls.
Dark/Fly Dark/Fly/Power Dark/Fly/Power Satan Chao The Chao's jesters grow upwards and turn into two huge horns.
Dark/Fly Dark/Fly/Swim+Run Dark/Fly/Swim+Run None
Dark/Fly Dark/Fly/Swim+Power Dark/Fly/Swim+Power None
Dark/Fly Dark/Fly/Fly+Run Dark/Fly/Fly+Run None
Dark/Fly Dark/Fly/Fly+Power Dark/Fly/Fly+Power None

Dark/Run Evolutions

Before After Second Evolution Nickname Description
Dark/Run Dark/Run/Normal Dark/Run/Normal None The colours of the Dark/Run Chao turn slightly darker.
Dark/Run Dark/Run/Swim Dark/Run/Swim None Turns a darker blue with peachy coloured markings.
Dark/Run Dark/Run/Fly Dark/Run/Fly None The Chao's spikes seem to split slightly and the markings become a bright yellow.
Dark/Run Dark/Run/Run Dark/Run/Run (Advanced) Shadow Chao Black with red markings, and three spikes on the back of its head. Resembles Shadow.
Dark/Run Dark/Run/Power Dark/Run/Power None Made up of dark blue colours and its middle spike grows slightly more upwards.
Dark/Run Dark/Run/Swim+Run Dark/Run/Swim+Run None
Dark/Run Dark/Run/Swim+Power Dark/Run/Swim+Power None
Dark/Run Dark/Run/Fly+Run Dark/Run/Fly+Run None
Dark/Run Dark/Run/Fly+Power Dark/Run/Fly+Power None

Dark/Power Evolutions

Before After Second Evolution Nickname Description
Dark/Power Dark/Power/Normal Dark/Power/Normal None Just like the Dark/Power Chao except this Chao's colours are darker.
Dark/Power Dark/Power/Swim Dark/Power/Swim None It has a dark green colour with a light blue tummy. Its hands are stripy.
Dark/Power Dark/Power/Fly Dark/Power/Fly None A dark purple colour with a lighter stomach and has orange stripy hands.
Dark/Power Dark/Power/Run Dark/Power/Run None A greeny colour with orange stripy hands and a stripy head.
Dark/Power Dark/Power/ Dark/Power/Power None This big Chao has a big curvy, stripy head and large stripy hands.
Dark/Power Dark/Power/Swim+Run Dark/Power/Swim+Run None
Dark/Power Dark/Power/Swim+Power Dark/Power/Swim+Power None
Dark/Power Dark/Power/Fly+Run Dark/Power/Fly+Run None
Dark/Power Dark/Power/Fly+Power Dark/Power/Fly+Power None