Jeri Katou

Jeri is a preteen girl age 12, with brown eyes and shoulder-length brown hair which is worn with a ponytail on the left side and a green hairclip. She wears a yellow shirt under a green dress, yellow socks, and white and cerulean sneakers. She usually carries a yellow dog sock puppet with a red mouth, pink ears, black nose, and dark brown eyes. At first, Jeri is not very important to the series. She just plays as a school girl Takato has a crush on and won't become a Digimon Tamer until later on. It might be said that she is a sort of perfect child, because of her cheerful and happy personality. However, there was a scene when she had claimed she was not interested in Digimon, but had cards dropping out of her pocket when she fell. She was known for her dog-shaped sock puppet, which she uses to strike-up conversations.

Where Kazu Shioda and Kenta Kitagawa ran away when the existence of Guilmon was proven, Jeri was quick to befriend the strange Digimon, becoming the first non-Tamer to do so.

Jeri is into the Digimon Card Game and has some very rare cards in her possession. Takato's friend Rika Nonaka gave her some pointers on what cards to use, beginning a friendship between the two. Jeri seeks to become a Tamer, and chases after Leomon when he first appears. She eventually becomes Leomon's Partner before she and the other Tamers, as well as Kazu and Kenta, headed out into the Digital World in search of Calumon.

Jeri proves herself to be a very capable Tamer with potential for greatness, even using the rare and powerful LadyDevimon card on Leomon to destroy the evil Digimon Orochimon who had kidnapped her, but unfortunately her career is cut short when Beelzemon destroys Leomon and uploads his data.

Following this Jeri becomes withdrawn, believing that her destiny is to be alone. Some time during their return to the real world, Jeri's cheerful facade is ripped away and through flashbacks and a brief explanation she delivered to Takato, her less-than-cheerful past is revealed. Her biological mother had died a while ago and when Jeri met her stepmother, she didn't give her a chance, as she was still very deeply traumatized by her mother's death. Following this Jeri began to think she was a bad person because while deep down she knew her stepmother was a nice woman, she still felt unable to accept her and couldn't empathize with her. She also thinks over and over about the words that her father said after her mother's death, which Leomon repeated before dying: "it's all because of Destiny."

Jeri showed no sign of caring about what was going on around her and she kept on looking into her now dead Digivice. The only real reaction came when Takato and Guilmon, now fused into Gallantmon, were about to kill Beelzemon after defeating him; she yelled at them to spare him, and when Beelzemon asked her why, she tearfully said she didn't want anyone else to die because of her. She later showed more emotion when Rika returned after becoming Sakuyamon, where she said she was afraid she had lost another friend. When she disappeared for a moment and then came back, her eyes were different, as if something possessed her, and she had an evil smile, even after the kids were back in Tokyo.