Kid Buu - Super Buu - Majin Buu

Super Buu's body is mutating once again! Majin Buu's first task after assuming this hideous new form is the total destruction of Earth! With the Earth erased from existence, Buu goes on a manhunt for Goku and Vegeta, leaving world after world annihilated in his wake. The battle to end all battles is set to begin! Goku and Vegeta take their shots at Buu, but the monster;s superior strength drives both to the edge of death. After the miraculous power of the Dragon Balls restores the Earth and its inhabitants to life, Goku issues a plea for all of the planet's souls to combine and team up to destroy the evil Buu once and for all. The Spirit Bomb is ready, loaded, and locked on Majin Buu! What will it take for the weary Goku to summon enough strength to deliver the blast?

Cell- The perfect Android

This is the super android called Cell. He has each most of the main characters DBZ in him which makes him very strong by and almost unstoppable. He was created to destroy Goku and the world with him and he almost succeeded but one small boy was able to stop him. Cell has many forms, he starts out in larva form and begins to grow when he reaches his full size, a bit bigger then a human, he has the urge to absorb the other androids created by Dr.Gero. He was programmed to do this because with each one he swallows, he takes on a new stronger form. After he finally absorb all of the androids, Cell thought he was invincible and nothing could beat him he liked to mock his enemies but he soon found out that you shouldn't make the wrong person mad.....

Frieza

This character used to be the strongest person in the universe, He was known as lord Freeza and was a threat to all life. He only used his powers for evil and wanted to be supreme ruler but Goku managed to beat him, before it was not too late. He has a known Brother who was shown cooler) and his father King Cold, Cooler was killed by Goku, or so was thought Cooler came back even strong then before he was now meta Cooler and he was powered by the big get star eventually Goku and Vegetea killed him. Later on in the series Freeza also came back and this time with his father it turns out Freeza was saved before he appeared to die and he had robotic parts attached to him to replace the limbs lost. Although Freeza came back stronger then before Future Trunks came and destroyed both him and King Cold

http://www.homepagez.com/dragonballaf/frieza.htm

Majin Buu

Buu is the last enemy in Dragonball Z, he doesn't look very strong at first, but looks can be deceiving..... He can turn his enemies into his favorite food and eat them which then he takes on some of their appearences and powers. In the series we see different versions of him. At first we see fat buu which seems nicer then the others and acts like a child, the reason for this is because there was a war between all the kai's and buu even though buu was out numbered he was still a challenge for them and he went around eating all of the kai's and took their powers, Buu came went around eating them all until he came across one of the kai's who was fatter and seemed the nicest..it appeared this kai's quality was his niceness so after eating him Buu had some niceness in him but he still had his evil trait as the dominant one. Eeve so Fat Buu befriended Mr. Satan and Mr. Satan convinces Buu to be nice. All seems well until Fat Buu's evilness seperates from him so one is good and the other is evil then the evil Buu gets the upper hand and absorbs the fat Buu that Buu gets stronger and absorbs Piccollo, Gotenks and then Gohan! Veggetto comes and gets absorbed so he can rescue his friends from the inside since everybody escapes he turns into his real form kid Buu! Because there is no one else is inside Buu anymore he reverts back into his small weaker form but he is still very strong and pure evil since no good people were inside of him. He has no hesitation in killing and he doesn't toy around with his ememies like the other villans, he just kills them.

http://www.homepagez.com/dragonballaf/majinbuu.htm

ABOUT THE DRAGON BALLS

USING THE DRAGON BALLS
In all, there are five main rules/steps/requirements to use the Dragon Balls.
1. Collect all 7 Dragon Balls.
2. Do not hesitate in wishing because the Eternal Dragon will leave.
3. Basically the same thing as above: think of your wish before summoning the Eternal Dragon.
4. Don't attempt to attack the Eternal Dragon. His powers are strong. You will die in a blink of his eye.
5. After the wish is made, the Dragon Balls will scatter all over the Earth. They will also become stone for a period of time.

THE EARTH DRAGON BALLS
The Dragon Balls were created by Kame, the guardian of Earth, who escaped the Planet Namek as a young boy and crashed on Earth with no memory of his home planet. In order to become Guardian of Earth, he was forced to seperate himself. The old, wise, good Namek became known as Kame, while his evil self came to be known as Demon King Piccolo, the "father" of the current Piccolo. While the evil Piccolo terrorized the world, the good Kame stands guard over Earth atop his Lookout, also the location of the Room of Spirit and Time and the Pendulum Room. This is where also the place where Kame created the Dragon Balls.

The Earth Dragon Balls are about the size of a baseball and are yellow, each with 1-7 red stars on them to identify them. Whenever someone collects all seven of the balls, they can summon the Eternal Dragon, Shenlong. The Eternal Dragon will grant them one wish. In DBZ, the Dragon Balls are mainly used by the good guys to resurrect people from the dead, but the bad guys usually want immortality (the only one I know of to succeed was Garlic Jr). Unfortunately, the Dragon will only grant the wish once...ever. So if someone is resurrected and they die again, they cannot be ressurected again. (Note that this does NOT mean only one person could ever be resurrected. Shenlong will grant variations of the same wish)

Also, the Earth Dragon Balls made by Dende after Kame's "death" can grant two wishes, but they can still only resurrect a person once.

THE NAMEK DRAGON BALLS
The original Dragon Balls, these are about 4-5 times bigger than the Earth Dragon Balls, closer to the size of a basketball. The Namek Dragon Balls work the same as the Earth Dragon Balls except for three variations:

1) They will summon a different Dragon, Porunga.
2) You must say Porunga before the balls will summon the Dragon.
3) You must make the wish in the Namek language.

Unlike the Earth Dragon Balls, the Namek Dragon Balls will grant three wishes. Also, since they are the original Dragon Balls, they are capable of resurrecting anyone or any group of people an unlimited number of times, as long as the death was unnatural.

THE BLACK STAR DRAGON BALLS
These Dragon Balls first appeared during Dragon Ball GT. They are identical to the Earth Dragon Balls, except they have darker stars on them. They are stronger than the Earth Dragon Balls, therefore their wishes cannot be reversed by any other Dragon Balls. Oh, there's also one other big catch: if the Black Star Dragon Balls are not brought back together within one year of the wish being made, whatever planet the wish was made on will explode! And, if that's not enough for you, the Black Star Dragon Balls don't scatter over the Earth, but over the entire Universe, making them much harder to find.
http://www.angelfire.com/anime4/jcbaggeedbz/aboutdragonballs.htm

THE FUSION DANCE AND THE POTARA EARRINGS

Towards the end of Dragon Ball Z, Earth got in it deep when nearly everyone was killed fighting Majin Buu. In an effort to save Earth, Goku introduced the remaining fighters to the Fusion technique. There are two versions of this technique.

1.FUSION DANCE:

This is the primary form of fusing. Taught to Goku in Other World by the Metamorese, two fighters of the similar age, height, race and power level must perform a series of complicated dance maneuvers. If performed successfully, they will merge into one incredible fighter, though the fusion will only last for 30 minutes. The following are successful fusions using the Fusion Dance:
Goten and Trunks = Gotenks
Goku and Vegeta = Gogeta

Of course, this doesn't always work. Should the dance be done incorrectly, the fusion will fail and result in a fighter who is either extremely fat or very old and feeble. Either way, the end result is a very weak fighter. The following are failed fusions using the Fusion Dance:

Goten and Trunks = Fat Gotenks
Goten and Trunks = Old Man Gotenks
Goku and Vegeta = Fat Gogeta

2.POTARA EARRINGS FUSION:

While in Other World, the Old Kai gave his life so Goku may help defeat Super Buu. Goku realizes he needs to fuse with Gohan to defeat Buu, but won't have time to teach him the Fusion Dance. Fortunatly, the Old Kai gives him hope: the Potara Earrings. By wearing the Potara Earrings, one simply has to wear one earring and look at another person wearing the other earring to fuse together. The good thing is that this is a quick fusion, and will result in a fighter waaay stronger than one created by the Fusion Technique. The catch? This fusion is permanent. There are only three known successful fusions with the Potara Earrings:

Goku and Vegeta = Vegetto

(NOTE: Despite the Potara Earrings permanent fusion side effect, Goku and Vegeta were able to seperate while inside Super Buu because of the difference in physics inside Buu)

Supreme Kai and Kibito = Kibito Kai
Old Kai and a Witch = Old Kai

(NOTE: This is how Old Kai gained his power enhancement techniques.)

http://www.angelfire.com/anime4/jcbaggeedbz/fusiontechpage.html