T.K. Takaishi is a character in the anime and manga series Digimon Adventure and Digimon Adventure 02. He is the younger brother of Matt Ishida . He is partnered with Patamon, and embodies the trait of Hope.

T.K. grows a lot during the last years after his first adventure. He is 11 (5th grade) in the original version and 13 (7th grade) in the dub. At the start of April 2002, he and his mother moved to Odaiba, with T.K. attending Odaiba Elementary in the same class as Davis and his good friend Kari. Because he and Kari are already good friends, T.K. immediately becomes the rival (and sometimes friend) of a paranoid Davis. Like Kari, T.K. has a slight advantage compared to the new kids because he has had the most experience with Digimon.

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