The Saiyajins are a warrior race who shared Planet Plant with the Tsufurujins. Using their ability to transform at a full moon the Saiyajins over powered the Tsufurujins and gained control over the planet. The Saiyajins made one of them, named Vegeta, king of the planet and reanamed the planet as Planet Vegeta.
The Saiyajins soon went into business taking over other planets and selling them. Soon Freeza, an evil alien warrior, feared the Saiyjins potential and destroyed their home word killing their whole race except for four of them. The remaining four were Goku, Vegeta, Raditz, and Nappa. (There were also more survivors; four more Saiyajins named Turles, Paragus, Brloy, and Tarble; and two Tsufurujins named Baby and Dr.Raichii).
Later on Half-Saiyajins were born on Earth. Gohan was the first but he was soon followed by Trunks and then Goten.
Great Ape - Every Saiyan with a tail is capable of this transformation. When they look into the full moon they transform in a large ape like creature which drastically increases their strength and durability while losing all sense of self and becoming feral. Great Ape's typically can use an Energy Blast from the mouth as a means of ranged attack. Great Ape transformations increase a Saiyans power 10 times. Even so,e hal blooded Saiyans like Gohan can become Great Ape's. With training or a high enough power level a Saiyan can mantain control of his Great Ape form like Vegeta showed during his battle with Goku on Earth.
Users - All full blooded Saiyans and Gohan
Golden Great Ape - A Saiyan who has already become a Super Saiyan(see below) can become this golden variant of the Great Ape with enough access to a full moon. This form is much more powerful than a regular Great Ape and is comparable to a Great Ape going Super Saiyan. This form seems more difficult to control since Vegeta who can control his Great Ape form, failed to control and went feral when he change into this one.
Users - Goku and Vegeta
Super Saiyan - A form only acheivable when a Saiyan of significant power experinces a fit of extreme rage and has a direct need to take this transformation. Super Saiyans have r little physical change except for the blue eyes, blond hair, and yellow aura but the strength difference is enormous. Super Saiyans after transformed go through a personaliy change as well. Goku who normally enjoys fights with strong opponents even if they are evil becomes and avenging warrior hell bent on his enemies defeat. Vegeta when he first transformed became even more arrogant and prideful than before. With a desire to test his strength against strong adversaries.
Users - Goku, Vegeta, Gohan, Future Trunks, Broly, Trunks, Goten, Bardock
Super Saiyan 2 - A Super Saiyan that has gone beyond, Super Saiyan 2's are incredibly powerful and have pushed the limits of their potential. Gohan was the first person to achieve this form. In this state the hair becomes spikier and the yellow aura gains an electrical effect. Super Saiyan 2 has roughly double the power of the previous transformation.
Users - Gohan, Goku, Vegeta, Future Trunks(video game only)
Super Saiyan 3 - This form is achievable only through extreme training and the final form in the manga, Super Saiyan 3 has some noticeable differences from the previous forms. While the electric aura and spike blonde hair remain, the hairs length increases to be about waist to knee length. The form increases the power output of the Saiyan to unbelievably high levels. This form is rarely matched and even more rarely beaten.
Users - Goku, Gotenks, Vegeta(video game only, Broly(video game only), Future Trunks(video game only)
Super Saiyan 4 - An anime only transformation. The form is radically different from any previous transformation. Super Saiyan 4's gain Red colored fur over most of their body and their hair length become longer, but is more akin to their standard hair and they keep their natural dark color. hey Saiyan in question keeps their electric yellow aura. This form seems to be a mix of the Great Ape transformation and the Super Saiyan aura. This is the pinnacle of Saiyan evolution.
Users - Goku and Vegeta
List of Saiyans
- Bulla (1/2 Saiyan 1/2 Human)
- Future Gohan (1/2 Saiyan 1/2 Human)
- Future Trunks (1/2 Saiyan 1/2 Human)
- Gohan (1/2 Saiyan 1/2 Human)
- Goku Jr. (1/16 Saiyan 15/16 Human)
- Goten (1/2 Saiyan 1/2 Human)
- Pan (1/4 Saiyan 3/4 Human)
- Trunks (1/2 Saiyan 1/2 Human)
- Gogeta (Fusion of Trunks and Goten through the Fusion Dance)
- Gotenks (Fusion of Vegeta and Goku through the Fusion Dance)
- Vegito (Fusion of Vegeta and Goku through the Potara Earrings)
Non Saiyan Beings with Saiyan blood
- Bio-Broly (Artificial Clone with Broly's DNA)
- Cell (Genetic Android with the blood of Goku, Vegeta, Raditz, Nappa)
- Super Buu (Absorbed at one point Goten, Trunks, and Gohan)