Tai & sORA
Tai And Sora are the best friends and also are in the same soccer team, in what they both are good. Tai are always there and very worried if something happens to Sora, He have shown how much he cares for her when he got his Courage crest since he got this thanks to Sora because she was kidnapped and he have to unit all his courage to save her even when he was a bit scared. he also trust in her this can be shown when he leave his little sister Kari in her command when she was ill. They are very close and if something is causing her problems Tai would ask her what is happening, he is always able to help her at any moment. Sora for her part is worried not just for TK or Kari for Tai Too and she always talk with him if something concerns her, she have faith in that Tai is a good leader and she is always ready and able to help Tai, they care for each other and they always want what is the better for them, when she was missing in episode 26 he was very worried and concerned why she wasn't with them, Sora trust in Tai's plans even when she can think that won't work.
Joe & mimi
Prior the series is known that Joe was Mimi's counselor at the summer camp where they were before to go to the Digital World. for this reason is maybe why Joe is very protective over her. as a gentleman if he makes someone to fell down he runs to help that person, in that ocassion was Mimi, she fell down when all of kids saw a restaurant near the place where they saw telephones, as they were very hungry they run very fast and Joe made Mimi's to fell down but thanks to that they didn't get cough in the trap that one of the Dark Master's subordinate prepared for them. both of them work as a team and could save the day, Joe knows very well Mimi and on episode 25 when she was acting very selfish he was concerns about why she was so selfish, for any reason he calls her "Mimi Kun" and he is always acts like his counselor even when they are not in the summer camp anymore. When Mimi decided to leave the group Joe offers himself to stay with her and protect her, they ended meeting many friends who later help them to defeat the Dark Masters. Mimi thinks that Joe as her summer camp Joe has to act like that even now when they are not at the summer camp, she gets to know Joe very well since they lived many experiences together thought the Digital World.
Matt & sora
Matt is a rebel kind kid who is the same age as Sora, During the series they build a mature relationship and then they form an unique bond. Sora also believes in him when he decides to leave the group and she promised him that she will take care of TK, during his time alone with Gabumon he thanked her and the others for understand, When Sora was under extremely worried for take care TK, Look for Matt at the right time and fall in a dark cave, Matt alongside Joe were the only ones that could save her from the dark cave where Matt was trapped moments before her, this shown that they batting similar challenges, at the final Sora and Izzy protected Tai and Matt since they were the ones that will do the final shoot. Matt and Sora get to know better each other and to a form a strong bond thanks to their visit to the Digital World.
Izzy & Mimi
Even when Izzy and Mimi were classmates prior the series and are the same age, Izzy think in different things and have other interests while Mimi is just focus in go home, Izzy is interested in find the mysteries of the Digital World, For his manner of analyzing everything is one why Mimi find hard deal with him, but they both eventually go to an accord, this can be shown in episode 10 when Mimi were trapped with Izzy at some ancient ruins, since they got to that ruins Izzy started to investigate and Mimi started to cry because Izzy was more worry for the mystery of that those ruins than her, later Mimi finds out the Mystery, they also can work good as a team and when the Dark Masters were controlling everything and the only ones that were in a tree with all the digimons, Agumon leaves the responsability to Izzy for look after Mimi. Mimi also turns out polite towards him and care for him deeply, So they both are really good friends and a great team.
Tai & mimi
In a start they didn't interact at all but as the series progresses they start to interact and then Interact more, this can be show in many ocassions like in episode 3 Mimi said that she can walk more, then Tai encourage her to not give up, he have shown worry about her like in episode 15 when the koromons take her to have a bath, Tai alongside with Izzy thought that they kidnapped her so when they open the courtains that hide the bath he and Izzy saw her taking a bath they suddenly blush and Mimi started to throw them things, Mimi have also encourage Tai too, like in episode 17 when Tai was sad because he made agumon to envolve into Skullgreymon, Mimi then comforts him, in the following episodes like 25 Tai alnoneside joe save Mimi from a palace, in the next episode Tai wanted to help Mimi calling her princess, Mimi told him that she wasn't a princess, in episode 27 as Aguomon and Palmon were working together, Tai and Mimi were close too, Mimi comented that she was sad because they have to be hiding again Tai and Joe told her that it will be just for a moment, Then in the episode 37 Tai saves Mimi from Myotismon's base, at the Dark Masters Saga Tai finally understand why Joe, Mimi and Yamato left the group and he then try to make them join again, They make a good team and it seems that they got to interact and know a little bit more about each other in their journey to the Digital World.
TK &kari
Since Kari appeared in the middle of the series, TK and Her have been close because they are the youngest of the group and they have some things in common, like they both have older brothers who always are trying to protect them, they are the same age, their digimons can evolve into angels, TK's crest is Hope and Kari's crest is Light. In Episode 43 when TK was able to get out from Puppetmon's house Kari is the first in congratulate him, In Episode 48 TK is very worried and sad seeing Kari very ill, Tai trust in TK to protect her little sister, he also commented to izzy that TK and Kari are the same age when Izzy and Tai weren't talk about that, In Episode 49 TK is worried for some kind of light that Kari had and in all the moent he was besides her trying to protect her, In Episode 50 Tk commented that he is happy that Kari is alright now, In Episode 52 Sora ask to TK to protect Kari, he accpets but when Piedmon appears TK start to cry but he soon stops saying that he can't cry because he will make Kari to cry and then she will loose her hope , when piedmon catch TK by his feet, he told to Kari to let him go but she refuse to do that and keep holding Tk by his hand. They are a great team and they are very good friends.