Also known as: Vault-girl, VaultGirl, ボルトガール
Vault Girl is a mascot of Vault-tec, a major technological developer of the Fallout universe, before that world's atomic apocalypse. Vault Girl is the female counterpart to Vault Boy.
She has Blonde Hair in a Bob Cut. In fanworks (particularly NSFW ones), she is also often depicted with Huge Breasts and in a Unzipped Vault Suit.