- Voiced by: Toshiyuki Toyonaga
One of the silently dedicated members of Mukuro's Gang, Chikusa is an ace with YoYos. Not only is he good with them, but they also carry some sort needles that may or may not be poisonous. Along with his usually apathetic personality, this guy spends almost all of his time with his dog-like antithesis, Ken, trying to free Mukuro from his prison. In the future, he's still just as stoic as always, but he does it in style. He also seems to like drinking bottles of stuff.
- Dark and Troubled Past
- Embarrassing Nickname: Ken and M.M call him "Kakipi".
- First-Name Basis: But he is always referred to as "Chikusa" by Mukuro and Chrome.
- Killer Yo Yo
- Scannable Man: For some reason, he has a barcode on his cheek.
- Scary Shiny Glasses
- The Stoic: Fittingly, his element is shown to be the tranquil Rain.
- Voiced by: Ryo Naitou
Scars Are Forever, is something that Ken knows well. You wouldn't give very much sympathy, until you learned of his super Dark and Troubled Past with his companions Mukuro and Chikusa. Other than that, he's just a Jerkass, to Chrome, pretty much. Or maybe he's just Tsundere. Who knows. He's just the Team Pet. Literally. He's got Animal Motifs everywhere, being that his main ability is to take on aspects of some violent animal. Think Animorphism meets TV.
- Animal Motifs
- Dark and Troubled Past
- Hot-Blooded: Rather fittingly, he uses Sun flames, just like Ryohei.
- Scars Are Forever: Has a large scar going from one cheek, across the top of his nose, and to the other cheek.
- Tsundere: Towards Chrome, for the most part.
- Voluntary Shape Shifting: Via grills, of all things.
- Voiced by: Takeshi Maeda
A young Mafia man whose family took Mukuro Rokudo in as a child. However he was betrayed and brainwashed by Mukuro's Hypnotic Eye, which forced him to kill his entire family. He was then forced to work for The Kokuyo Gang, and fought Yamamoto under the guise of his boss. His memories returned after his defeat, and he went back to Italy, promising to help the Vongola whenever they needed it.
- Big Damn Heroes: Turns up at the end of the Varia arc to kick some ass and cut off the enemy escape route.
- Body Double
- Chekhov's Gun: The ring he gave to Tsuna, which acts as a handy Pocket Protector.
- Epic Flail: Specially designed to make sure it hits you whether you dodge or not.
- Face of a Thug: And the girls still drool over him...
- Friend to All Children: As shown when Fuuta, I-Pin, and Lambo use him as a jungle gym.
- Good Scars, Evil Scars
- Go Out with a Smile: He wasn't really dead though.
- Grand Theft Me
- Hell-Bent for Leather
- Mr. Fanservice
- Shirtless Scene
- Voiced by: Takahiro Hirano
A Memetic Molester with a Slasher Smile. That pretty much sums up Birds. He threatened the girls (who should've been in the kitchen), and almost got Tsuna to stab himself. The only upside to him even existing is that he introduced Hibird, Hibari's first little pet-thing.
The Bloody Twins
- Voiced by: N/A
A creepy pair or murderous twins, who work along side with the sadistic Birds. Not only do they have ridiculously mutated bodies from their punishments in prison, but they have the horrible methods of killing people that got them there too! They end up getting beat down by Trident Shamal and TYL I-Pin.
- Voiced by: Shouko Ishii
The Chick of Mukuro's Kokuyo Gang before Chrome comes along. She reappears in the Future arc.
- Clingy Jealous Girl
- Designated Girl Fight: With Bianchi.
- Future Badass: It's hard to say at this point but the fact that such a minor character has reappeared in the Future arc must mean something.
- Improbable Weapon User
- Instrument of Murder: Microwave clarinet FTW!
- Jerkass Has a Point: While her treatment towards Chrome may come off as rude, she additionally tries to warn her that Mukuro was only using Chrome for his own purposes.
- Kick the Dog: She converted quite a lot of people over to Chrome fandom.
- Little Miss Badass
- Musical Assassin