A Doll who approaches everything with peak lazinessーexcept for gaming and reading manga. She's mastered the ultimate skill: falling asleep anytime, anywhere, under any circumstance. Although she seems to embody the philosophy of "lying flat" to the extreme, she reveals her dependable side in times of crisisーthough in her words, "It'd be better if we just never ran into any 'crisis' at all∙∙∙" Mechty is a Doll with a forever sleepy face, who lives by the motto “sleep 'till you die, unless you must be awake to survive.” Whether she's in a boring meeting or on a smoke-filled battlefield, Mishty can sleep like a log at any place and any time. But don't worry, there are many ways to keep her awake, like manga, video games, zombie movies... or just pulling that switch on her high-performance battery. A Doll constantly jumping between being a drab girl and a wild war machine, what a sight to behold every day. “Yes, yes, the boring and reliable Mechty is here... Commander, my stuff I had delivered in advance is already here, right?”

UMP9, often shortened "9", has a preset candid and friendly personality[1] and is a capable T-Doll. After her encounter with SMG UMP45, she has developed a strong admiration for her, and while knowing she can't match SMG UMP40's importance in 45's eyes,[2] she aims to be useful to her in any way possible and to help her accomplish her goal.[3] 9 often assists 45 in electronic warfare, but their hardware differences make her abilities a far cry from 45's.[4][5] During the formation of Squad 404, she also warned AR HK416 that should she try to kill 45, she would have to get through her first.[6] Within Squad 404, 9 acts as 45's lieutenant and usually sides with her in any situation, though she is not free from falling on 45's bad side occasionally. Despite how dysfunctional Squad 404 is as a team, 9 insists on calling it a family

HK416 (also known as HKM4, Clukay or Klukai) is a serious and foul-mouthed Doll who takes great pride in her status as an Elite T-Doll and her combat performances. She also holds a strong sense of justice that pushes her to protect the weak and her teammates. Paradoxically, as pointed out by AK-74U, 416 considers that only excellence in tactical and strategic thinking and knowing how to protect their own lives will differentiate T-Dolls from mere tools to be used by humans, but she also puts great value in sacrifice in battle and following orders.[1] She also commented on not being particularly fond of fighting and to being somewhat risk-averse, but to not have any choice on the matter within Squad 404.[2] Within 404, HK416 acts as the main fighter, possessing the best combat specs. She begrudgingly respects SMG UMP45's authority despite their shared past, but often complains about 45'reckless strategies.[3] 45 often mocks 416's pride but respects her skills, considering her for next in line as squad leader.

UMP45, usually shortened to “45”, is a rogue Tactical Doll and the leader of the black ops mercenaries of Squad 404. Her driven and coldly aggressive personality, the result of a significant betrayal, is thinly veiled by her dry humor, and serves to conceal a deeper goodness of soul she shows only rarely.[1] She is described as wearing an ominous smile