The official character setting states that UMP40 is a T-Doll with super sunny, cheery personality and feels superior over the others because of her UMP heritage, but she does possess a strong will and strong sense of team spirit. Most of her silly actions and speeches are purely for the purpose of gaining other's attention.

UMP40 address herself with "Atai (あたい)", typical self addressing pronoun used by younger girls. As evident from her secretary and logistic mission quotes, her hobby is sunbathing, which would explain why she appears more tanned than the other dolls. Other than sunbathing she also seems to enjoy partying. With her cheery personality she is good at making friends with other T-Dolls, perhaps the silly way she behaves merely serves to strengthen the relationship bonds between comrades. - IOP Wiki

Faction: Griffin & Kryuger/National Security Bureau

Manufactured/Revised by: I.O.P./Sangvis Ferri

Type: SMG

Body type: SSD-62D/DSI-8

Known aliases: UMP40