Kalvin (Kor. 칼빈) was a member of the assassination squad working for Dr. Crombel. He is sent to Korea along with Mark to aid Yuri in collecting the remaining data of Frankenstein's research.


Kalvin appears to be a boy of around 15 years of age. He has long, spiky black hair with the portion behind his ears being dyed yellow. He has dark circles under his light grey eyes, implying his work is exhausting.


He is shown to be respectful towards Mark and Yuri. Though he has a pretty serious attitude when it comes to his works. According to Yuri, Kalvin has a taste for women older than him. Kalvin likes to trick his opponents. This attitude is shown when he tricks M-21, Takeo and Regis to consuming his poison in exchange for the antidote to save the children but later doesn't fulfill the exchange. Even after his death, the antidote taken from him proves to be fake.  

Plot OverviewEdit

Traitorous Clan Leader ArcEdit

Kalvin accompanies Mark and Yuri on the mission assigned to them by Dr. Crombel to procure the remaining data from Frankenstein's residence. Mark comes up with a plan for the data to be brought to them rather than going for it themselves. They kidnap the children and Kalvin administers poison to them.
They wait in the school premises where M-21 arrives, however, the RK team manages to rescue the children as well as protect the data from the assassins. The two teams encounter in the school grounds and Kalvin reveals that he has poisoned the children. An enraged M-21 attacks them, later joined by Regis and Takeo. Kalvin finds himself confronted by Regis. He gets repeatedly pushed back and threatens Regis, showing the vial of antidote which he'd destroy should Regis continue attacking. Kalvin repeats this for everyone to hear and gives Regis, M-21 and Takeo small pellets that he demands they take if they want the antidote. They fall prey to his trick and Kalvin laughs while revealing that he has actually given them lumps of poison and refuses to give the antidote to Regis as promised. Regis' weak attacks are of no use and Kalvin gloats in his triumph.
However, the sudden arrival of Rael turns the table. Kalvin, not knowing who he is, tries to attack him but the instant that his attack hits the ground, Rael appears behind him and stabs a hole in Kalvin with only his bare hand. Yuri and Mark flee to save themselves while Kalvin is left behind to face Rael's wrath. The convict tries in desperation to threaten of destroying the antidote, however, Rael shows not the least concern. Kalvin is then killed by Rael who procures the antidote as well.

Powers & AbilitiesEdit

Kalvin is skilled at assassination verified by him belonging to the assassination squad.

Poison ManipulationEdit

Kalvin specializes in preparing poisons and antidotes. It is unknown he carries poison, or if he generates poison. He generally uses green-colored, acid-like poison during battle to overcome his opponents. His poison is quite strong; corrosive enough to melt a wall.



Rai's Group Rai · Frankenstein · M-21 · Tao · Takeo · Shinwoo · Ik-Han · Yuna · Suyi
Nobles Raskreia · The Previous Lord · Gejutel · Karias · Krasis · Kei · Ludis · Rael · Ragar · Rajak · Regis · Rozaria · Seira · Claudia · Edian · Gradeus · Ignes · Lagus · Roctis · Urokai · Zarga
Werewolves Muzaka · Maduke · Lunark · Kentas · Ashlyn · Garda · Dorant · Juraki · Grui · Gaitan· Kuharu · Mount · Drakon · Kaiyo · Gayare · Mirai · Urne · Uzhir · Gorma · Krano · Braang · Zaiga · Gaura · Gotaru · Bashum
Union Elders 1st Elder · Maduke · 3rd Elder · Roctis ·Lunark · Urokai · Zarga · 8th Elder · 9th Elder · Rostere · Muar · 12th Elder · Dr. Crombel
Union Agents & Members Dr. Aris · Bonerre · Geo · Hammer · Haydn · Ignes · Infected · Jake · Kalvin · Ked · Krantz · Lutai · Mark · Mary · Rodin · Shark · Taze · Yuizi · Yuri
KSA Lim Taesik · Sangeen · Yonsu
Others M-24