T.K. begins to see Tai as an older brother figure in the same way he sees Matt but is unaware of the implications that Matt draws out of this. He sees Tai as a leader to the group.
As T.K's older brother, Matt always tries to protect T.K at all costs in Season 1. But his actions are too overprotective, and it even made T.K mad at him for treating him like a kid. When T.K was kidnapped by Puppetmon, Matt almost goes insane and yells at Sora for deleting Kiwimon, Puppetmon's sudordinate. Matt gets depressed when T.K gets away from Puppetmon alone, thinking that he does not need him anymore.
In 02 T.K. starts to realize the impact of his parents' divorce and feels that he should see Matt more often.
Sora is like T.K.'s older sister figure, and T.K. goes to her for anything more motherly.
T.K and Izzy have had their share of childlike interactions, such as when they experimented on whether Izzy's computer codes could digivolve Patamon and when they slept-talk to one another during their train ride to Odaiba
T.K. is interested in why Mimi has her strange quirks and tends to see her in a stereotypical sort of way.
According to Joe, he was in his wood working class in summer camp, and T.K. nearly cut off one of his fingers by mistake. Joe has risked his own life to save him on at least two occasions.
T.K. visibly spends a lot of time with Kari during both seasons, although it is clear both have fallen out of touch with each other during the intervening years. They seem to relate to each other the best throughout both series, both having a great deal of experience with Digimon. He also admits (somewhat accidentally) that he cares about her a great deal and fears losing her during her struggles with the Dark Ocean.
In the Chinese dub, Sora implies they kissed under a mistletoe on Christmas.
In Takeru's character song, "Focus", he describes someone who seems similar to Kari, and in the chorus, he asks, "Am I the focus of your heart?"
T.K. is usually amused by Davis's antics. Interestingly T.K. doesn't appear to have any aspirations of leading the group and generally accepts Davis as the nominal leader, even though he doesn't always agree with Davis. However, he frequently steps into the role whenever Davis is absent or beyond reasoning with. Whenever Davis shows himself to be too impulsive or does not show rational thinking, T.K. tends to act like his brother and will try to snap Davis back to his ideals.
Generally, however, T.K. can understand Davis's ideals and is more sympathetic towards him than Matt and Tai are, despite Davis being quite rude to him sometimes.
T.K. lives in the same apartment where Yolei lives. Also, in Episode 1, he is seen using the same lift as Yolei and in Episode 2, he reveals to his fellow friends that one of the new DigiDestined is a girl living at the same apartment as him.
Cody and TK are very close henceforth how their two Digimon fuse together and Cody is sometimes shown really worried about him like the time Cody asked Matt about why he was nervous to let Patamon battle.
T.K. at first is cold and bitter towards Ken and is disgusted at his ideas of "toying" with darkness; he manages to take Ken down in a stream of insults and logic, and manages to shock him so that he can fight Ken momentarily (even though Ken is a master at judo at that point).
T.K. is still, however, forgiving, and he is the first one after Davis to accept Ken into the group (in the Japanese version, he agreed with Davis that Ken had changed, but still was against him joining until Ken apologized to the DigiDestined).
|Main characters:||Taichi "Tai" Kamiya | Yamato "Matt" Ishida | Sora Takenouchi | Koushiro "Izzy" Izumi | Mimi Tachikawa | Joe Kido | Takeru "T.K." Takaishi | Kari Kamiya|
|Digimon:||Agumon | Gabumon | Biyomon | Tentomon | Palmon | Gomamon | Patamon | Gatomon|
|Villains:||Devimon | Etemon | Myotismon and DemiDevimon | Dark Masters | Apocalymon | Diaboromon | Millenniummon|
|Other characters:||Gennai | Willis, Gummymon, and Kokomon | Ryo Akiyama | Koromon | Leomon | Ogremon | Wizardmon | Other characters|
|Relationships:||Taichi "Tai" Kamiya | Yamato "Matt" Ishida | Sora Takenouchi | Koushiro "Izzy" Izumi | Mimi Tachikawa | Joe Kido | Takeru "T.K." Takaishi | Kari Kamiya|
|Other media:||Digimon: The Movie | Digimon Adventure | Our War Game! | Digimon Grandprix! | Character Song + Mini Drama 1 (2, 3) | 2½ Year Break | Anode/Cathode Tamer | Novel | Albums | PSP game|
|See also:||Digimon | Digital World | Digivice | Crests | Black Gear | List of episodes|