At first, Mimi is seen as the ditzy girly girl who adds more than a touch of superficiality to any situation that she is in (in the dub, she is notorious for noting how "stylish" a newly digivolved Digimon is or isn't). In the original Japanese series, rather than being portrayed as a typical valley girl, she is portrayed as a naive and carefree child. She has the Crest of Sincerity in the dub, or the junshin no monshou (純真の紋章 - translatable as the crest of purity or empathy) in the original series, which activates during a battle in which Togemon battles against DarkTyrannomon. She is ten years old (the same age as Izzy Izumi, yet a full head taller) and in the fourth grade. She comes from a loving family that never seems to have any problems. After looking at them, it is fairly easy to see where she gets her seemingly carefree attitude from; they're very emotional, somewhat ditzy and expressive people who openly show their love for each other in all the possible ways.
Despite being horribly out of touch with reality at points, Mimi is arguably one of the most realistic and feeling characters of the first season, as she demonstrates near the end of the series when she decides (temporarily) that she can't fight alongside the other DigiDestined after seeing a lot of the friends they made earlier die for their sake. Her closest friend in the group appears to be Sora Takenouchi, who seems to be the first one to comfort her in most situations that scare her, and is the main reason that she came to her senses at one point where she manages to influence a group of Gekomon to treat her as a princess and then throws both Tai and Joe in the dungeon when they try to make her stop.
the digidestind and their digimon now are worshiped by jungle people in an uncharted of the digital realm, at some point, they encountered Sam, Max, and a few others and ever since, then lead to a new found partnership to the shell louge squad.