The Deadly Stem Force is a group of four dark-skinned heavily muscled creatures that are controlled by Iris Hepburn.
Profile[]
In the manga, they are four scientists, who are members of Millefiore's Research Facility. They have experimented on themselves to impress their assistant and their object of affection, Iris. As they experimented more and more, they turned into mindless monsters that only heard and obeyed Iris.[1]
In the anime, the Deadly Stem Force were not formerly human, but artificial ones. They were humanoids created by the four scientists, who decided to experiment after being encouraged by Iris. The first prey of the Deadly Stem Force was these four scientists who created them, as Iris betrayed them.[2]
Abilities[]

Muscle Scrum
When Iris whips the Deadly Stem Force with her Cloud Whip, the Propagation characteristic of the Cloud Flames multiplies and propagates the monsters' muscles and other organs in their bodies, allowing them to grow and, in the same sense, regenerate rapidly.
- Muscle Scrum (マッスル・スクラム, Massuru Sukuramu?): All four slaves combine their bodies to make a stationary shield. It was used as a defensive wall by Iris, but it couldn't withstand Tsuna's completed X-Burner.[3]
References[]
- ↑ Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 23: Chapter 206
- ↑ Katekyo Hitman Reborn! anime: Episode 127
- ↑ Amano, Akira. Katekyo Hitman Reborn!. Tokyo: Shueisha, 2004–2012. Print. Vol. 23: Chapter 208
Trivia[]
- The Deadly Stem Force seems to let Iris whip them without fighting back.