The girl that Tsuna admires. She is somewhat air headed (She did not question the idea of an infant being in the Mafia and thought that was cool, and like Takeshi, probably thinks it is all just a game like "Cops and Robbers"). She is also the second person to take the Dying Will Shot in the series; her form is more quiet and polite (Yet she will still break things to prove her point).
In the Future arc, she has finally seen Tsuna in action after being sent nine years and ten months into the future, at the very moment when her future self was in the same exact place and time as his current self. Her future self calls Tsuna by his name, without any suffixes, and it is revealed that she was attending a seminar camp before being hit with the ten year bazooka.
After Tsuna defeats the Millefiore member sent to kill Kyoko, they are taken to the base. However, Reborn does not tell Kyoko anything about the Mafia, merely that they were in a bad situation. Despite this, Kyoko manages to remain outwardly calm, though Tsuna observes that her face was very pale. Kyoko then comforts Haru and goes to the kitchen to cook for the group. She later runs into the adult Hana who gives her a letter from her brother. She returns to the base with Tsuna where she and Haru are taking care of everyone.
The girl who likes Tsuna, she attends Midori Middle School, one of the toughest elite schools to get into in the area. She initially adored Reborn, but after she was saved by Tsuna, she diverted her adoration towards him instead. She loves children and is usually the one to babysit Lambo and I-Pin. Her father is a Math teacher in a university.
Haru, along with Lambo and I-Pin, was also sent to the future in the Future arc and was protected from a blast by Takeshi, who was also sent to the future. According to Tsuna and Hayato, adult Haru has become more feminine, but her way of thinking is still the same.
After Reborn told Haru of the devastation in the future, hiding from her details about the Mafia, Haru seems to lose her calm and cries, hugging Tsuna and begging him to take her back home. She is then comforted by Kyoko and went to cook with her.