Here are all stages of all persons

Saiyan

This is a special rase
Normally they have a monkey like tail.
this is needed to collect energy for the Oozaru mode
They were all killed by Frieza because he was afraid of them
Only Nappa, Goku, Brolly, Vegeta and Radditz weren't killed.

Super Saiyan(ssj)

When a saiyan transforms into a Super Saiyan his hair will become goldblond and will stand straight up.
The first Super Super Saiyan couldn't handle it's awsome power and destroyed himself.
You can only become a Super Saiyan if you become super mad.

Super Saiyan 2(ssj2)

This stage was first reached by gohan
his hair doesn't differs much with Super Saiyan level 1
it has only on hair for his eyes
If it wants more power it's agility will drop and it becomes a ultra saiyan that is not a stage but it's between ssj 1 and ssj 2

Super Saiyan 3(ssj3)

This it's hard to become a ssj 3 even more difficult then become a Super Saiyan level 1 for the first time from a nomal Saiyan.
It's hair reaches his knees so long is it.
ssj3 is very powerful but you can only be a ssj3 for a short time because it asks for many energy so the job has to be done very quickly.

Super Saiyan 4(ssj4)

This form has no goldblond hair anymore and when the Saiyan hasn't a tail anymore it will get a tail then.
Only ssj4 can become a golden Oozaru

Super Saiyan 5(ssj5)

This Super Saiyan level does not excist so i have no information about it

Sorry i don't have information of bebi yet but it will come quickly

Stato embrionale

Here he's an embrio he's in is egg here

Guscio

This is his egg

Cell appena nato

Here he just came out of it's egg

Cell 1th stage(imperfect Cell)

Here he absorbed all citizens of Japan
In this form he is as strong as Android 16.
He has a tail for aborbing the androids 17 and 18.

Cell 2th stage

Here he absorbed android 17.
But still he has a tail for absorbing android 18
Vegeta was in this form much stronger then Cell.
But vegeta allows him to absorb android 18 and then vegeta is no match for him.

Perfect Cell

Here he absorbed all people and android 17 and 18.
All the z warriors are no match for him,
he made the baby cells.
He is destroyed by Gohan ssj2.

Baby-Cell

They were created by Perfect Cell and were allowed to play with the z warriors when Perfect Cell gave them the command to destroy the z warriors gohan went ssj2

Fat Buu

This is the good buu the nicer half
He's a friend of mr. Satan wich won the budoukai

Evil Buu

Fat Buu's evil half
He's stronger then Fat Buu
When he absorbed Fat Buu he bacame Majin Buu

Majin Buu

This is the result of Evil Buu absorbing Fat Buu
He's is sronger then both Buus
His weakness is sweet Food

Majin Buu

Here he absorbed ssj3 Gotenks and Piccolo
He's very strong and clever

Majin Buu

Inside Buu Gotenks turned back into Goten and Trunks
Because of this he got weaker.
He's now using the Piccolo inside him and got even more clever.

Majin Buu

This is what he looks like after absorbing gohan along with trunks, goten and piccolo the gohan inside him gives him tons and tons of power.

Uub
this is the result of buu turned in a good guy
he can fuse with Fat buu and become super uub
the picture beneath is super uub

Frieza stage 1

This is his beginning here his voice looks like a womans voice.
No one before he was on Namek they saw more forms of him because already then he was to strong for them
Vegeta made him transform to stage 2

Frieza stage 2

Here he killed Krillin bUt he was healed by Dende and Krillin cut its tail of.
Here he has no womans voice anymore and looks very scary and he is also bigger now.
Piccolo made him transform to his third form.

Frieza stage 3

Here he looks even more scarying and is more powerful to
He almost killed Piccolo but the young saiyan Gohan fired an enormous Masenko on him and he was almost killed and he made him go to stage 4

Frieza stage 4

Here he is not scary and ugly anymore.
he killed many warriors but he was almost killed by a monkey(he called goku a monkey).
In this form he still used 1% of its power.

Cyborg Frieza

He was almost killed but rebuild and came back
They all feld the power of frieza but Trunks came from the future and sliced him into the middle with its sword