Introduced in Leviathan and expanded upon within Limbus Company, Identities are alternate forms of individuals from Mirror Worlds accessed by Mirror technology.

When using an Identity, the individual gains the equipment, skills, and personality of that identity. Limbus Company makes extensive use of this, allowing the Sinners to utilize different Mirror Worlds to their advantage in combat.

Young-ji initially invented the Glass Window, which was further refined by Yi Sang into the Mirror. After the League of Nine Littérateurs collapsed, the remaining members spread out throughout the City with the Mirror technology. The technology quickly came into possession of the Wings, syndicates, and other groups of the City who began researching, experimenting and improving upon it.

Current list of Official identities:

(Please update and organize as new Identities are added)
Syndicates:

• Blade Lineage
• Kurokumo Clan
• Tingtang Clan
• Los Mariachis
• Twinhook Pirates
• The Middle
• Dead Rabbits
• The Ring

Corporations:

• R Corp
• G Corp
• K Corp
• N Corp
• T Corp
• W Corp

Associations:

• Zwei Association
• Shi Association
• Cinq Association
• Liu Association
• Seven Association
• Devyat Association
• Dieci Association
• Oufi Association

Fixer Offices:

• Rosespanner Workshop
• Molar Boatworks
• Molar Office
• MultiCrack Office
• Fanghunt Office

Walpurgis Night:

• Lobotomy Corp
• Hook Office
• Dawn Office
• Streetlight Office
• Full-Stop Office

Other:

• Lobotomy Corporation Remnants
• LCCB Limbus Company Clear Before
• R.B Ryoshu's Bistro
• Technology Liberation Alliance
• Pequod
• Wuthering Heights
• Yurodiviye Yurodiviye is the plural name. Individual members (and in this case, identities) are known as Yurodivy.
• La Manchaland