| KI | Kaiji Itou | fictional character from Kaiji |
| KS | Kai Satou | fictional character from Your Turn To Die -Death Game By Majority- |
| KD | Kaito Daimon | fictional character from Phi Brain: Puzzle of God |
| KK | Kaito Kuroba | fictional character from Detective Conan |
| KS | Kaito Sera | fictional character from Classroom Crisis |
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Kaká | Brazilian association football player (born 1982) |
| KG | Kakushi Gotou | fictional character from Kakushigoto |
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Kali | |
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Kali Uchis | American singer-songwriter (born 1994) |
| K | Kamina | fictional character from Tengan Toppa Gurren Lagann |
| K | Kaminaga | fictional character from Joker Game |
| KA | Kana Arima | fictional character from Oshi no Ko |
| KT | Kanade Takahashi | fictional character from First Love Monster |
| K | Kanae | |
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Kana Hanazawa | Japanese voice actress (born 1989) |
| KI | Kana Ijima | fictional character from Tsuredure Children |
| KK | Kana Kimishima | fictional character from Parasyte |
| K | Kanami | fictional character from Log Horizon |
| KM | Kana Minami | fictional character from Minami-ke |
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Kane Parsons | American filmmaker |
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Kangana Ranaut | Indian actress (born 2014) |
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kangaroo | common name for some marsupials indigenous to Australia in the family Macropodidae |
| K | KANGEL | fictional character from Needy Streamer Overload |
| KM | Kaori Miyazono | fictional character from Your Lie in April |
| KY | Kaoru Yamazaki | fictional character from Welcome to the N.H.K. |
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Karamo Brown | American television host, reality television personality, and activist |
| KZ | Kara Zor-El | fictional character from Superman/Batman: Apocalypse |
| KK | Kare Kano | Japanese anime television series |
| KK | Kare Kano | Japanese manga series |
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Karen Armstrong | author and comparative religion scholar from Great Britain |
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Karen Fukuhara | American actress (born 1992) |
| KP | Karen Page | fictional character from Daredevil (Marvel Comics series) |
| KP | Karen Page | researcher |
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Karen Silkwood | Labor union activist, chemical technician (1946–1974) |
| KKN | Kareshi kanojo no jijō (1st edition) | first edition of Japanese manga series |
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Kari Lake | American journalist and politician, head of Voice of America (born 1969) |
| K | Karin | fictional character from Naruto |
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Karl Deisseroth | American optogeneticist |
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Karlheinz Stockhausen | German composer (1928–2007) |
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Karl Jaspers | German-Swiss psychiatrist and philosopher (1883–1969) |
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Karl Kraus | Austrian playwright and publicist (1874–1936) |
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Karl Lauterbach | German politician and former Federal Minister of Health |
| KL | Karl Löwith | German philosopher (1897-1973) |
| KM | Karl Max | Holocaust victim (born 1903) |
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Karl Maximovich | Russian botanist (1827–1891) |
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Karl May | German writer (1842–1912) |
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Karl Rove | American political consultant and policy advisor |
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Karolina Wydra | Polish-American actress |
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Karoline Leavitt | American writer and political aide (born 1997) |
| KK | Karol Kolbusz | German philosopher/writer |