These are the available canon characters. Those with strikes through them are taken. If you do not see a canon character on the list, they may be reserved as an NPC; for example, King Cold, Master Roshi, King Vegeta, Kami, Guru. If not, ask about it and we will see where they are.
If you're unsure who many of these characters are and wish to learn about them, or need a picture, please visit this page: http://dragonball.wikia.com/wiki/Characters
Saiyan
Bardock
Borgos
Broly
Fasha
Goku
Nappa
Paragus
Raditz
Panbukin
Brocco
Shugesh
Tarble
Tora
Turles
Vegeta
Zorn
Earthling
Chaozu
"Captain" Yellow
"Colonel" Silver
"Colonel" Violet
"Emperor" Pilaf
"General" Blue
"General" White
"General" Tao
Mr. Satan
King Chappa
Krillin
Launch
Mai
Murasaki
Nam
Ranfan
Raven
Tien
Olibu
Upa
Shu
"Staff Officer" Black
Yajirobe
Yamcha
Half-Saiyans
Bulla
Gohan
Goten
Goten
Pan
Trunks
Namekians
Cargo
Dende
Nail
Piccolo
"Lord" Slug
Xenos
Cui
Dodoria
Zarbon
Abo
Appule
Kado
Burter
Jeice
"Captain" Ginyu
Guldo
Recoome
Salza
Arqua
Chapuchai
Froug
Maraikoh
Mijorin
Pikkon
Tapkar
Torbie
"Commander" Zeeun
Medamatcha
Tapion
Minosha
Bojack
Bido
Bujin
Kogu
Zangya
Doore
Neiz
Amond
Cacao
Daiz
Zeshin
Bun
Raiti
Zakuro
Arcosian
Frieza
Cooler
Chilled
Kuriza
Demons
Babadi
Buu
Cymbal
Piano
Drum
Tambourine
Dorodabo
Syn
Eis
Nuova
Oceana
Shula
Angria
Dabura
Janemba
Garlic Jr.
Ginger
Nicky
Sansho
Mustard
Salt
Spice
Vinegar
Shins
Kibito
"Eastern" Supreme Kai
Constructs
Bebi
Rilldo
"Major" Metallitron
"Commander" Nezi
Android 8
Android 13
Android 14
Android 15
Android 16
Android 17
Android 18
Android 19
Android 20
Cell
Hatchiyack
Ebifurya
Kishime
Misokatsun
If you're unsure who many of these characters are and wish to learn about them, or need a picture, please visit this page: http://dragonball.wikia.com/wiki/Characters
Saiyan
Bardock
Borgos
Broly
Fasha
Goku
Nappa
Paragus
Raditz
Panbukin
Brocco
Shugesh
Tarble
Tora
Turles
Vegeta
Zorn
Earthling
Chaozu
"Captain" Yellow
"Colonel" Silver
"Colonel" Violet
"Emperor" Pilaf
"General" Blue
"General" White
"General" Tao
Mr. Satan
King Chappa
Krillin
Launch
Mai
Murasaki
Nam
Ranfan
Raven
Tien
Olibu
Upa
Shu
"Staff Officer" Black
Yajirobe
Yamcha
Half-Saiyans
Bulla
Gohan
Goten
Goten
Trunks
Namekians
Cargo
Dende
Nail
Piccolo
"Lord" Slug
Xenos
Cui
Dodoria
Zarbon
Abo
Appule
Kado
Burter
Jeice
"Captain" Ginyu
Guldo
Recoome
Salza
Arqua
Chapuchai
Froug
Maraikoh
Mijorin
Pikkon
Tapkar
Torbie
"Commander" Zeeun
Medamatcha
Tapion
Minosha
Bojack
Bido
Bujin
Kogu
Zangya
Doore
Neiz
Amond
Cacao
Daiz
Zeshin
Bun
Raiti
Zakuro
Arcosian
Frieza
Cooler
Chilled
Kuriza
Demons
Babadi
Cymbal
Piano
Drum
Tambourine
Dorodabo
Syn
Eis
Nuova
Oceana
Shula
Angria
Dabura
Janemba
Garlic Jr.
Ginger
Nicky
Sansho
Mustard
Salt
Spice
Vinegar
Shins
Kibito
"Eastern" Supreme Kai
Constructs
Bebi
Rilldo
"Major" Metallitron
"Commander" Nezi
Android 8
Android 13
Android 14
Android 15
Android 16
Android 17
Android 18
Android 19
Android 20
Cell
Hatchiyack
Ebifurya
Kishime
Misokatsun