Yagami Hikari

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Hikari, the younger sister of Yagami Taichi, is partnered with Tailmon. She is a sweet, gentle and generous person. She always finds the best in people and avoids fighting whenever possible. She tends to put others' wellbeing and happiness before hers.

She lives with her father, Susumu, a businessman, her mother, Yuuko, a housewife, and her older brother, Taichi. In Adventure, they also had a cat, Miko.

Prelude to Digimon Adventure
When they were young, Taichi and Hikari lived with their parents in Hikarigaoka. On March 1995, they discovered a DigiTama that came out of their father's PC. Before long, it hatched into Botamon and evolved into Koromon, and the two children befriended it. However, it became feral when it evolved into Agumon, and then Greymon. A Parrotmon that also crossed over from the Digital World challenged the aggressive Greymon and defeated it. However, Hikari revived it with her whistle, allowing it to overpower Parrotmon and causing both Digimon to vanish from the human world. Following this incident, which was appropriated to a "terrorist bombing", the Yagami family moved to Odaiba.

A year after the Hikarigaoka incident, Taichi insisted on taking an ill Hikari out to play ball. While outside, she fainted, and had to be hospitalized for pneumonia. However, as she told Taichi, she didn't blame him for it.

Digimon Adventure
After that incident, she remained a rather sickly girl, and was not able to go to the camp with the others due to an illness. However, when Taichi and his own Koromon showed up at the Yagami residence, she welcomed them and immediately knew that Koromon was a Digimon, not thinking he was weird at all.

Later, Vamdemon came to the Real World and used the Crest of Light, as well as duplicates of it, to try and locate the eighth Chosen Child. Taichi and the others came back to the Real World to search of the Chosen Child as well. In the end, it was Tailmon, one of Vamdemon's most trustworthy servants, who found Hikari, and discovered that she was the eighth Chosen Child and her partner. After the fall of Vamdemon, Hikari and Tailmon went with the others to the Digital World to free it from the Dark Masters.

Digimon Adventure: Our War Game
Hikari was not involved in the war on the Internet because she went to a friend's birthday party. Despite Taichi's pleas, she just couldn't get out, not wanting to insult her friend.

Between Digimon Adventure & Digimon 02
During May of 2000, Hikari arrived in the Digital World and gave up her Crest power to free the Four Holy Beasts. As a result, Tailmon lost the ability to become Angewomon.

Digimon Adventure 02
Hikari grew a lot during the years after her first adventure, becoming more confident and self-assured and developing an interest in photography. On the first day of fifth grade, she discovered that, in addition to her old schoolmate Motomiya Daisuke, one of her new classmates is her old friend Takaishi Takeru. Because she and Takeru were already good friends, a paranoid Daisuke immediately pegged Takeru as a rival for Hikari's affections. Soon, she found out that she, along with Takeru, Daisuke, Inoue Miyako and Hida Iori, were chosen to fight an evil human child called the Digimon Kaiser, who was taking over vast parts of the Digital World. Before long, her old Digivice was modified into the new D-3 and dhe received the Digimental of Light, which allowed a depowered Tailmon to evolve into Nefertimon. Hikari had a slight advantage compared to the new kids because she has had more experience with Digimon.

After some time fighting the Digimon Kaiser, Hikari fell victim to the influence of the World of Darkness, and was taken there from the Real World. She found several Hangyomon-like creatures who wanted to fight their oppressor, who had installed a Dark Tower in their world. When Takeru, Patamon and Tailmon came to help, she was able to have Tailmon evolve into Angewomon and destroy the Dark Tower and the Airdramon that guarded it. However, this turned out to be a trap; the Hangyomon were, in fact, creatures of darkness who had wanted Hikari to bear the children of their master, Dagomon. With her friends' intervention, she escaped this fate and returned to the Real World unharmed.

Hikari was sucked into the influence of the World of Darkness again some time later, accidentally dragging Tailmon, Miyako and Hawkmon with her. They also encountered Ken there, and Hikari realized that Ken had the same weakness to the World of Darkness as she had. Feeling out of place, Miyako started making off-color remarks, which she had lamented after causing Hikari and herself to fall from a cliff. To get her out of her funk, Hikari slapped her, which caused them both a bit of a shock. Miyako later slapped Hikari when the darkness got the better of her, insisting that Hikari is stronger than that. When the two admitted that they want to be a little more like each other, their hearts were as one, and Aquilamon and Tailmon Jogressed into Silphymon.

On Christmas Eve, Hikari went to Ken's Christmas party with the rest of the younger Chosen, although it ended abruptly as they had to send rampaging Digimon back to the Digital World and destroy a Dark Tower. The next day, the Chosen Children found out that Digital Gates were open in the entire world. Qinglongmon gave the Chosen Children one of his Digicores to help power up the Digimon, and Hikari went with Koushirou to Hong Kong help the Asian Chosen Children round up the wild Digimon who had appeared in the Real World.

Back in Japan, the children had to fend off the Demon Corps, a group of evil Digimon led by Demon, as well as Archnemon, Mummymon and their boss, the human Oikawa Yukio. She and the other children helped Ken open a gate to the World of Darkness and banished Demon through the gate. However, Oikawa managed to run away. In his wake, he left twenty children, who had Dark Seeds sown into their necks.

Hikari and the others followed the seeded children for the following days, facing Oikawa several times. On December 31st, they followed Oikawa and the children to the world of dreams, where it was revealed that Oikawa Yukio was possessed by the spirit of Belial Vamdemon, who absorbed the power of the Dark Seeds in the seeded children's necks to gain a corporeal form. He killed Archnemon and Mummymon, which shocked and frightened Hikari and the others. When Daisuke and XV-mon started fighting back, Belial Vamdemon subjected the children to an illusion, showing their greatest desire. Hikari's desire was for a completely peaceful world where humans and Digimon can live in harmony, but it was broken by Tailmon's explanation that it wasn't real, and XV-mon appeared to take her back to the other kids. When everyone's illusions were broken, Hikari used the power of the dream dimension against Belial Vamdemon, with Tailmon, Angewomonmon, Nefertimon and Silphymon appearing all at once to fight Belial Vamdemon. After Belial Vamdemon escaped to the Digital World, the light from her D-3 helped weaken Belial Vamdemon and power up Imperialdramon Fighter Mode's Giga Death cannon.

Digimon Adventure 02: Diablomon Strikes Back
Hikari went with Miyako to collect Kuramon and send them to Koushiro's computer. However, she later parted with Miyako and went into the Internet with Takeru, to aid their brothers in the battle against Diablomon. After Diablomon was beaten she returned to the real world to watch the battle against Armagemon.

Digimon Adventure 02: Series Finale epilogue
By 2027, Hikari has become a teacher, which was her longtime dream. She is married and has a son.

Digimon Hurricane Touchdown!! Supreme Evolution!! The Golden Digimentals
Hikari and Takeru were in New York visiting Mimi. When Mimi disappeared, Hikari sensed a "crying Digimon" and they witnessed Wallace trying to talk to a rampaging Wendimon. Wallace's Terriermon battled Wendimon when he attacked but was easily beaten. Wendimon suddenly disappeared.

She and Takeru took a train to try and reach the others but Wendimon damaged the train. They arrived in the middle of the battle to see that Wendimon had evolved all the way to Cherubimon. Hikari stated that he is no longer the "crying Digimon". Takeru and Hikari's Digimon evolved to Seraphimon and Holy Dramon and were easily beaten, but it was just enough for them to bring Daisuke and Wallace the Digimentals of Miracles and Fate.