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Ken Anime.png
With Lady Luck's favor protecting me, there's no way I can lose! I'd even win russian roulette with 5 of the chambers full!
~ Ken Ooyanagi

Ken Oyanagi, also known as Rock-Paper-Scissors Kid or Rosham Boy, is a minor antagonist in JoJo's Bizarre Adventure: Diamond is Unbreakable. A normal child turned stand user thanks to Yoshihiro Kira, he challenges Rohan Kishibe to several rounds on rock-paper-scissors, in which his stand is at risk. He wields the stand Boy II Man.

Ken is voiced by Chika Sakamoto in Japanese and by Laila Berzins in English.


Whilst he was climbing a telephone pole, he had been pierced by the Bow and Arrow thanks to Yoshihiro Kira, resulting in a hole in his left cheek and the birth of his Stand, Boy II Man.

He asks Rohan Kishibe if he would like to place janken/rock, paper, scissors, but is turned down. When Rohan goes for a taxi, Ken challenges him to janken, to see who gets the taxi ride. After Rohan wins, he gets the taxi. Later at a restaurant, Ken takes an empty table and makes a scene. After winning another janken game, Rohan kicks him out. At the library, Ken challenges Rohan for a book about plants, but the mangaka punches the janken boy. However, Rohan tells his rival he is victorious as Heaven's Door is sucked into his cheek.

However, Rohan turns Ken into a book to write "I cannot attack Rohan Kishibe" on him then separates him. Rohan learns that Ken's Stand can steal energy from his victims if he wins against them, then suddenly, Ooyanagi changes the words so he can attack. Ken places Rohan's arm under his control and since janken consists of five rounds, the mangaka attempts a fourth round, but loses when Ken uses paper to strangle rock.

Now, a third of Heaven's Door is stolen, and Rohan now becomes determined to win. The two jump into the air and throw paper, resulting in a draw. Just as the boy is throwing paper against rock, Ken chooses rock, resulting in another tie.

Ken knows that Rohan would not dare send for help against a kid, and wins the bet. He seemed unfazed after standing proudly on broken glass. On their next janken round, Ken attempts use scissors to cut Rohan's paper, but his hands move to rock suddenly and Heaven's Door returns to Rohan.

To get revenge, Rohan attempts to make Ken resign from janken, but Boy II Man takes Shizuka hostage and demands a rematch. This time, Rohan does win three rounds again. Not wanting to accept defeat, Ken attempts to take his own life by jumping in front of a truck, but Yoshihiro Kira's photo becomes stuck against the windshield, saving both his and a amused Rohan's lives. In awe at his heroism, Ken swears to never user his stand to harm others again.

Powers and Abilities

Boy II Man

Rock paper scissors is not a game of chance, but a contest of force of will!
~ Ken Ooyanagi

Boy II Man's main ability has the ability to steal a person's energy and stand if they lose a game of rock-paper-scissors. Everytime he loses, he gains a third of the the opponent's energy/stand, and if the opponent wins three times, all of their energy and their stand is returned to them. If Ken wins three times, the opponent loses their stand for the rest of their days, and Ken is able to use that stand as well as Boy II Man, making him a surprising threat.


           JoJo's Bizarre AdventureTitle.png Villains

Phantom Blood
Dario Brando | Stone Mask Vampires (Wang Chan | Jack the Ripper | Bruford | Tarkus | Dio Brando) Undead People

Battle Tendency
New York Police Officers | Brass Knuckle Gangster | Donovan | Straizo | Stone Mask Vampires | Pillar Men (Santana | Esidisi | Wamuu | Kars)

Stardust Crusaders
Gray Fly | Impostor Captain Tennille | Forever | Devo | Rubber Soul | Hol Horse | J. Geil | Nena | ZZ | Enya Geil | Steely Dan | Arabia Fats | Mannish Boy | Cameo | Midler | Egypt 9 Glory Gods (N'Doul | Oingo | Boingo | Anubis | Mariah | Alessi | Daniel J. D'Arby | Pet Shop | Terence T. D'Arby) | Kenny G. | Vanilla Ice | Nukesaku | DIO

Diamond is Unbreakable
Anjuro "Angelo" Katagiri | Keicho Nijimura | Tamami Kobayashi | Toshikazu Hazamada | Yukako Yamagishi | Akira Otoishi | Rohan Kishibe | Bug-Eaten | Yoshihiro Kira | Ken Oyanagi | Yuya Fungami | Toyohiro Kanedaichi | Terunosuke Miyamoto | Cheap Trick | Yoshikage Kira

Vento Aureo/Golden Wind
"Leaky Eye" Luca | Polpo | Mario Zucchero | Sale | Squadra Esecuzioni (Sorbet and Gelato | Formaggio | Illuso | Prosciutto | Pesci | Melone | Ghiaccio | Risotto Nero) | Unità Speciale (Squalo and Tiziano | Carne | Cioccolata | Secco) | Vinegar Doppio | Diavolo

Stone Ocean
Tom Cruise | Gwess | Johngalli A | Thunder McQueen | Foo Fighters | Miraschon | Lang Rangler | Sports Maxx | Viviano Westwood | Kenzou | D an G | Guccio | Miuccia Miuller | Ungalo | Rikiel | Donatello Versus | DIO | Enrico Pucci

Steel Ball Run
Mrs. Robinson | Boomboom Family (Andre Boomboom | L. A. Boomboom | Benjamin Boomboom) | Oyecomova | Pork Pie Hat Kid | Diego Brando | Dario Brando | Dr. Ferdinand | Ringo Roadagain | Soldier | Blackmore | Sandman | Eleven Men | Scarlet Valentine | Mike O. | Wekapipo | Magent Magent | Axl RO | D-I-S-C-O | Diego Brando (Alternate World) | Funny Valentine

Rock Organisms | Locacaca Organization (Yotsuyu Yagiyama | Aisho Dainenjiyama | A. Phex Brothers | Tamaki Damo | Jobin Higashikata | Urban Guerilla | Doremifasolati Do | Poor Tom | Wu Tomoki | Dododo De Dadada | Obladi Oblada | Satoru Akefu | Tooru) | Ojiro Sasame | Kaato Higashikata | Zaihei Nigatake | Milagro Man's Stand User | Dolomite | Radio Gaga

Thus Spoke Kishibe Rohan
Rohan Kishibe | The Beggar | Mutsukabezaka | Gods of the Mountain | Moon Rabbit | Yoma Hashimoto | Yabubako-Hoshi | Eve | Eco-Terrorist

Cool Shock B.T.
B.T. | Police Officer | Kuroyama and Akagawa | Date | The Leader | The Major | Manabu | Manabu's Family | Outlaw Guys

Jorge Joestar
Eduardo Noriega | Funnier Valentine | The Funniest Valentine | Antonio Torres | Alejandro Torres | Javier Cortes | William Cardinal | Dio Brando (Jorge Joestar)

Miscellaneous Spin-Offs & Novels
Old Man Stand User | Absalom | Michal | Scribe Ani | Nameless Child Murderer | Rigatoni | Sogliola Lopez | Takuma Hasumi | Teruhiko Futaba | Hanae Orikasa | Sezione Droghe (Vittorio Cataldi | Angelica Attanasio | Vladimir Kocaqi | Massimo Volpe) | Prisoner 27 | Heaven Ascension DIO | Dija Maker | Scatola | Petsounds | Crossbow Wielder