Asuma Toki (飛鳥馬トキ, Asuma Toki) is one of the students studying at Millennium Science School who wields an Assault Rifle.

She is a member of Cleaning&Clearing and Paranormal Affairs Department.

Toki is the mysterious fifth member of C&C with the codename "04" (Zero-Four) in Millennium. Unlike the rest of C&C members, she is assigned as Rio's personal bodyguard at Seminar. As such, she is equipped with special armaments designed by Rio. The first is the "Mode 1" uniform, which takes a form as a regular maid uniform. It allows her to enter "Mode 2", which takes a form of a simplified maid uniform, enabling her to move at high speeds. The second is a large powered exoskeleton named "Abi-Eshuh" (アビ・エシェフ) that contains heavy weaponry and the ability to utilize Eridu's entire electricity grid and processing power.

Until now has mainly worked alone, but in fact, she has a lonely side...

https://bluearchive.fandom.com/wiki/Asuma_Toki

Hope it helps to understand her lore a little bit 😆 and regards of her bunny outfit... casinos + bunny girls = ??? I don't know you tell me 😏😂