Tamami Kobayashi is a minor villain from the fourth arc of JoJo's Bizarre Adventure, Diamond is Unbreakable. He is introduced as a confidence trickster who leads Koichi to believe that he had run over Tamami's cat with his bike – supposedly hidden in a bag which then splattered with blood. Despite that odd circumstance being questioned, Tamami demands a sum of money from Koichi as a compensation for the deed. He successfully pressures Koichi into feeling guilty, which puts his stand, The Lock, into action. As its name implies it is a stand in the shape of a lock which clasps over the target's heart and grows the more guilty its captive feels.

Tamami explains he got his powers 4 months ago from Keicho Nijimura; he reveals that he intends to use his powers to gain wealth and never have to work again. As he is bullying Koichi, Josuke and Okuyasu turn up and try to help their friend. Okuyasu punches Tamami, breaking his teeth and as a result feels guilty for it – which gets him a lock around his heart as well. Josuke then reveals that it was just a doll instead of a cat that was hidden in the bag and heals Tamami, thus freeing Koichi and Okuyasu from their guilt and Tamami's stand.

Tamami returns the money he had taken from Koichi but vows to get revenge. When we next see him he is at Koichi's house, talking to his mother. He explains that he is here to return Koichi's wallet and claims that Koichi has intentionally switched it with his, as Tamami's holds 500,000 yen. When Koichi's mother doesn't believe him, he tells her that there is a stub of a restaurant he went to inside of the wallet Koichi holds. His words were proven true thanks to a trick, leading Koichi's mother to feel guilty about her son and giving Tamami an opportunity to place The Lock on her. Koichi, enraged, attacks him, leading in turn for his sister to feel guilty as well to Tamami's advantage. Tamami deceives Koichi's two family members into feeling guilty further, causing them to fall under the highest level of The Lock's power – severe enough to have them attempt suicide. Finally, Koichi manages to convince his mother that he is innocent of the crimes Tamami had framed him of, by using his stand Echoes to amplify his plea for her to believe in her own son's words. This destroys the Lock and Tamami knows he has been defeated. From then on he respects and fears Koichi and even takes to calling him Boss Koichi.

After his defeat, Tamami reformed and took on a job of debt collecting. Later in the story Tamami briefly takes on the role as a juror when Josuke and Rohan gamble against each other during the dice game "18".


           JoJo's Bizarre AdventureTitle Villains

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

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

Stardust Crusaders
Gray Fly | Fake Captain Tennille | Forever | Devo | Rubber Soul | Hol Horse | J. Geil | Nena | Z.Z. | 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 | Undead People | DIO

Diamond is Unbreakable
Anjuro "Angelo" Katagiri | Keicho Nijimura | Tamami Kobayashi | Toshikazu Hazamada | Yukako Yamagishi | Akira Otoishi | Rohan Kishibe | Bug Eaten | Yoshihiro Kira | Ken Ooyanagi | Yuuya 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 | Jongalli A | Thunder McQueen | Foo Fighters | Mirashon | Lang Wrangler | Sports Max | Viviano Westwood | Kenzo | D&G | Guccio | Miu Miu | Ungalo | Rikiel | Donatello Versus | Enrico Pucci

Steel Ball Run
Mrs. Robinson | Boom Boom Family (Andre Boom Boom | LA Boom Boom | Benjamin Boom Boom) | Oyecomova | Pork Pie Hat Kid | Diego Brando | Dr. Ferdinand | Ringo Roadagain | Blackmore | Sandman | The Eleven Men | Scarlet Valentine | Mike O. | Wekapipo | Magent Magent | Axl Ro | D-I-S-C-O | Diego Brando from another universe | Funny Valentine

Rock Human | Locacaca Organization (Yotsuyu Yagiyama | Aisho Dainenjyama | A. Phex Brothers | Tamaki Damo | Dolomite | Jobin Higashikata | Kaato Higashikata | Doremifasolati Do | Urban Guerilla | Poor Tom | Wu Tomoki | Satoru Akefu) | Ojiro Sasame | Shakedown Road | Zaihei Nigatake

Spin-Offs & Novels
Absalom | Michal | Scribe Ani | Takuma Hasumi | Teruhiko Futaba | Rigatoni | Sogliola Lopez | Vittorio Cataldi | Angelica Attanasio | Vladimir Kocaqi | Massimo Volpe | Heaven Ascension DIO

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