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@masterkillerboss121

Mk1 @masterkillerboss121 #203718012

29 December 2016
account created (per Roblox API)
25 Sept 2026, 11:41
last measured (UTC)

Username record

@masterkillerboss121 — observed 25 September 2026

Roblox’s API lists prior usernames without dates; the dates above are when this register observed each name, which bounds — but is not — the change date.

Groups owned (as measured)

Blackbird Development#4188152
8

Open data

Download this user’s observed record: username history (CSV) · record (JSON)

Also a member of

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Chillz Studios#2782840 · 🌟Royal Member🌟
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Simple Bricks Trees#690489827 · Member
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Car Crushers Community#2726951 · Skilled Crusher
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Official Group of Drift Paradise#5216132 · 👤Standard Drifter
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Murder Mystery#1030692 · Innocent
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Billion Duck Hunters#1010818854 · Member
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Typical Games#2649054 · Member
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Thinking Project#1235888 · noob
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Frosted Studio#3385385 · Fans
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LDS II#15753989 · Fan
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Pilot Training Club#2794513 · Trainee Pilots
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Shyfoox Studios#2969540 · Foox
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Badimo#3059674 · Member
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InfinityInteractive#11257245 · Fans
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Animations: Mocap#4872031 · Member
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Piriyo#33242376 · Cool people
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Da Hood Entertainment#4698921 · Member
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United States Army    #3108077 · [E1] Private (Basic Combat Training)
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Lyte Interactive#5449496 · Member
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United States Armed Forces [USA]#3054949 · [E-0] Armed Forces Recruit
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StyLiS Studios#1103278 · Supporters
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Hapless Studios#5502618 · Supporter
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Μilitary Simulator#4800484 · No Division
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Stealth Developers#12266404 · Fan
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BeachBlox#5033680 · Visitor
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United States Army     #4121686 · [E1] Private
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xSquad#2943804 · // Community
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The Attack on Titan Project#3865381 · Low Class
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[AOT:P] Trainee Corps#3866549 · Phase I
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LisboKate#4159792 · Member
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detourious#9511290 · fan
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Official BloxWatch#3736200 · ‮s̸n̸̶̨ó͡i̶͞n͟ì̡m̴̶
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Attack on Titan: Scarlet#6133841 · Low Class
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The Dogeland Realm#4466080 · Citizen
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People's Revolutionary Army of the PRR#5485873 · Recruit
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Official CovertCode Fan Group#5596349 · Epic Fan
14,613
La Tostada#5938337 · Customer
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Quasar Cafe#6194895 · Quasarivian
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Asimo3089 Fan Club#6261 · Fans
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Phantom Tr0upe#7721846 · demons
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Hazem & Candelz#14465627 · -.-
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Melodious Dance Academy#7408053 · [LR] Enrolled
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hellcent#5138690 · buyer
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Attack on titan the final stand: Trainee corps#6292216 · Low Class Civilians / Trainee Corps
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Russian Military 2000s#3205368 · Private
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pmro#4096785 · Lit Members ¯\_(ツ)_/¯
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Im a nerd#9399424 · Nerds
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New york city aesthetic clothing line#6486727 · Customer
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Kenora Trading Company#6289929 · Frontiersman
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appleGarmy#7360500 · APPLES
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My Bunnies#5406655 · ew
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the dab of luck#4190872 · Member
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REVOLUTIONZ#7474681 · supporter ✭
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LAF.: Lexco Armed Forces#4516582 · [A] Approved Member
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Dan's Hideout.#9445212 · Member
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Funds_Donate#4001805 · Member
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Membership and rank as measured from this user’s public group list.