Here is a list of every Canon character that is a major character in the Soul Eater Anime. You can be someone who has died, but has reincarnated.
Shibusen
Meisters
Maka Albarn
Black*Star
Death the Kid
Kilik Lunge
Ox Ford
Kim Diehl
Franken Stein
Sid Barret
Weapons
Soul Eater Evans (he is not a Death Scythe yet, even though he is in the manga)
Tsubaki Nakatsukasa
Patty Thompson
Liz Thompson
Pot of Fire & Pot of Thunder (please play as both)
Harvar D. Eclair
Jacqueline O. Lantern Durpé
Mira Nygus
Death Scythes
Spirit Albarn
Marie Mjolnir
Justin Law (he is not evil in the anime)
Yumi Azusa
Other
Shinigami-sama
Blair
Crona
The Bad Guys
Witches
Medusa Gorgon (pretend she renicarnated)
Mizune
Eruka Frog
Queen Mabaa
Arachne (pretend she also reincarnated)
Arachnaphobia
Mosquito
Giriko
Other
Free
Other
Excalibur
Eibon (not as Noah-sama)
Shibusen
Meisters
Maka Albarn
Black*Star
Death the Kid
Kilik Lunge
Ox Ford
Kim Diehl
Franken Stein
Sid Barret
Weapons
Soul Eater Evans (he is not a Death Scythe yet, even though he is in the manga)
Tsubaki Nakatsukasa
Patty Thompson
Liz Thompson
Pot of Fire & Pot of Thunder (please play as both)
Harvar D. Eclair
Jacqueline O. Lantern Durpé
Mira Nygus
Death Scythes
Spirit Albarn
Marie Mjolnir
Justin Law (he is not evil in the anime)
Yumi Azusa
Other
Blair
Crona
The Bad Guys
Witches
Medusa Gorgon (pretend she renicarnated)
Mizune
Eruka Frog
Queen Mabaa
Arachne (pretend she also reincarnated)
Arachnaphobia
Mosquito
Giriko
Other
Free
Other
Excalibur
Eibon (not as Noah-sama)