Race Information:

Saiyan: This is one of the series' main races. All of the main characters belong to this race. They first arrived on the Planet Plant in 550AD and eventually took over the whole planet, renaming it Vegeta. They then encountered Frieza, who employed them to wipe planets of their life before being sold. Fearing they would one day overthrow him, Frieza destroyed them all along with the planet, leaving only Goku, Vegeta, Nappa, Raditz, Broly, Paragus and Turles as survivors.
Positives: Gain a extra 10 to every stat after a spar or death match.
Negatives: They Can never turn down a open challenges.

Human: This, surprisingly, is the race to which we all belong. Humans inhabit the Planet Earth, and apart from a few individuals (Tien, Yamcha, Choatzu, Roshi, Krillin), most are comparatively weak along side people like the Saiyans and Namekians, because most of the race does not know anything about KI manipulation.
Positives: They Gain a extra 5 to their KI after a spar or death match.
Negatives: Their Transformations are the weakest on the site.

Icers: This is the race to which Frieza, Cooler and King Cold belong. Not much is known of their origins. All that is known is that all 3 posses the ability to transform & not just once but several times. Doing so greatly increases their power.
Positives: Gain all their Transformations quicker then all the other races
Negatives: They can never Turn down a open Challenge.

Nameks: This race is first introduced to us when Goku fights Piccolo Daimao, who is a very old Nameks. But it isn't until the Saiyan Saga that Piccolo and Kami learn of their otherworldly origins. After Piccolo's death at Nappa's hands. Gohan, Krillin and Bulma depart to the Planet Namek, to gather the original Dragonballs to revive their friends. During this time all the Nameks are wiped out by Frieza and his men. They are eventually revived with the Earth's Dragonballs and sent to live on New Namek. All Nameks are asexual as Toriyama based them on snails and slugs.
Positives: Gain a extra 5 to all stats after spars and death matches
Negatives: the jump from their second and third

Mutants: The Mutants that appear in the series were usually very powerful and skilled fighters. The most well known mutants are the Ginyu Force. They work for Frieza and we see them fight Krillin, Vegeta, & Gohan until Goku shows up who defeats all of them but Captain Ginyu with ease. Of course there are many more mutants than just the Ginyu Force. in fact, a huge amount of Frieza's force are mutants. It's not always to easy to tell who is a mutant because they may just be part of a race we don't know about, but usually mutants have no one else who relates to them in appearance.
Positives: They Gain their first Transformation First
Negatives: They have the fewest Transformations.

Demons: Usually evil creatures, who like to kill. The King of Demons is Dabura, who is taken under control by Babidi. He was the first to fall by Buu when he is releases by Babidi. When we see him in Other World his emotions changed, he became a kind, very caring creature & he helps Bulma, Chi-Chi, and Videl look for Gohan because at this time they all think he had been killed by Buu even thought he had not.
Positives: Got the Strongest Transformations
Negatives: They get the first Transformation last. They have to start Evil

Android/Cell: This in an artificial race. Usually androids start out as another race, but are 'enhanced' with technology. The exception are the biotechnological androids like Cell. Cell is entirely created with the use of cells of other beings. All androids in the series are created by Dr. Gero, who even makes himself one. They usually look just like normal people or can look very strange. They are immensely powerful and most have a mission to kill Goku.
Positives: Their Transformations don't take up a lot of END
Negatives: They have to star off bad.