Kari is Tai's little sister. She was intended to be one of the Digidestined team from the beginning, but she had the flu and couldn't go to camp with the others.
Kari is a pocket mystic. Wise beyond her years, Kari is also full of compassion and patience. She's still a kid, though, and sometimes her empathy outstrips her judgement. However, you can be sure that everything Kari does is done for the right reasons.
Kari is a very nice girl and willing to help others out any time but sometimes she cares for the others TOO much and that might cause more trouble. She gets sick easy in first season.