- Meisters: are people with exceptional soul wavelengths and are paired with weapons.

- Demon Weapons: are human beings who have the ability to transform into a weapon. At the DWMA, they are paired up with Meisters, humans who are able to wield them in their Weapon forms. (If you choose to be one, you can decided which weapon they will become).

- The Star Clan: was an infamous family of ninjas who were descended from a long line of assassins. The follow the "Path of Demon".

- Humans: most abundant individuals.

- Enchanter: An Enchanter, or puppet engineer, is an individual who is able to use the magical skill known as Enchanting (a learned skill), a skill in which individuals mix soil (or other materials) and magic to create things.

- Vampires: Much like the common concept of vampires, vampires in Soul Eater appear to be human-like and well known for the blood of others for their own nurishment. However, unlike the traditional vampire, they're not killed under direct sunlight and do not need to feed often.

- Fairies: re one of the few monsters in the Soul Eater series that are not hostile towards humans. In fact, they are quite harmless and friendly.

- Werewolves: Like their fictious counterparts, they appear human-like but have the ability to transform into wolf-like creatures. However, it is done by what seems to be by will and not the result of a full moon. It also seems Werewolves are also known to be immortal. In addtion, their souls are uniquely recognized as a werewolf but also human.

- Ghosts: Ghosts are souls that have somehow not been able to pass on to the other side because they have been prevented. Can be good or evil.

- Witches: are powerful beings and the natural enemies of Shibusen as almost all of them have a destructive nature

Add information (Explanation of some terms):

- DWMA a.k.a Shibusen (Death Weapon Meister Academy): is an organization that fights against the monsters.

- Soul Wavelength: is the rhythm of one's soul. The wavelength carries the true characteristics of a person's soul.

- The Path of the Demon: One who chooses the Path Of The Demon chooses the striving for power and victory over the striving of earnest will and justice. Opposite of "Path of the Warrior"

- Path of the Warrior: One who chooses the Path Of The Warrior chooses the stirve for earnest will and justice over the stry for power and victory.