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.

Pictures

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

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

Neutral/Swim Evolutions

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

Neutral/Fly Evolutions

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

Neutral/Run Evolutions

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

Neutral/Power Evolutions

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

Hero/Normal Evolutions

Second Evolution	Nickname	Description
Hero/Normal/Normal	None	A general Hero Chao.
Hero/Normal/Swim	None	Has cyan colour markings and has bunny ear like things on its head.
Hero/Normal/Fly	None	Has weaker purple markings with two ball like things on its head.
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/Power	None	This Chao has dark blue markings with some pink strips. Has two ball like things on its head.
Hero/Normal/Swim+Run	None
Hero/Normal/Swim+Power	None
Hero/Normal/Fly+Run	None
Hero/Normal/Fly+Power	None

Hero/Swim Evolutions

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

Hero/Fly Evolutions

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

Hero/Run Evolutions

Second Evolution	Nickname	Description
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/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/Fly	None	Purple markings and blue wings, with a shaped object from its head.
Hero/Run/Run	None	Light blue markings and its head splits into three petal like things.
Hero/Run/Power	None	Has weaker purple markings. Its head has a long thing with a ball on the end.
Hero/Run/Swim+Run	None
Hero/Run/Swim+Power	None
Hero/Run/Fly+Run	None
Hero/Run/Fly+Power	None

Hero/Power Evolutions

Second Evolution	Nickname	Description
Hero/Power/Normal	None	Just like the Hero/Power Chao except is slightly bigger.
Hero/Power/Swim	None	Slightly chubby Chao with pink markings, and has shaped head pieces.
Hero/Power/Fly	None	Purple markings and has head pieces that look like petals.
Hero/Power/Run	None	This Chao has mellow pink/peach markings and has a rose like head piece.
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/Swim+Run	None
Hero/Power/Swim+Power	None
Hero/Power/Fly+Run	None
Hero/Power/Fly+Power	None

Dark/Normal Evolutions

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

Dark/Swim Evolutions

Second Evolution	Nickname	Description
Dark/Swim/Normal	None	Almost exactly like the Dark/Swim Chao, but has a longer spike behind its head.
Dark/Swim/Swim	None	Has the same colours of the Dark/Swim Chao and has small yellow wings.
Dark/Swim/Fly	None	This Chao is coloured blue and black, with a weird spike coming out of its head.
Dark/Swim/Run	None	This Chao has a spike coming from the back of its head, and has aqua coloured markings.
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/Swim+Run	None
Dark/Swim/Swim+Power	None
Dark/Swim/Fly+Run	None
Dark/Swim/Fly+Power	None

Dark/Fly Evolutions

Second Evolution	Nickname	Description
Dark/Fly/Normal	(Advanced) Reala Chao	Just like the Dark/Fly Chao except with longer jesters.
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/Fly	None	The jesters grow and become slightly jagged. Also becomes slightly darker.
Dark/Fly/Run	None	Has light purple markings and the jesters morph into balls.
Dark/Fly/Power	Satan Chao	The Chao's jesters grow upwards and turn into two huge horns.
Dark/Fly/Swim+Run	None
Dark/Fly/Swim+Power	None
Dark/Fly/Fly+Run	None
Dark/Fly/Fly+Power	None

Dark/Run Evolutions

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

Dark/Power Evolutions

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