Haru is an upbeat and enthusiastic girl, living a mostly carefree life in Namimori, as well as being known to be somwhat of an airhead. Haru is well aware of Tsuna's status in the mafia, although she doesn't know the complicated details and dreams to one day become the wife of a mafioso. Haru loves children and can become very protective towards them, especially towards Lambo and I-Pin, and dislikes the idea of children being involved in the mafia. She and Kyoko excel at cooking and housework very well.

While she is shown to be kind and caring, Haru is shown to be assertive in comparison to Kyoko, whenever Haru believes that Tsuna or Hayato are doing something wrong she usually doesn't hesitate to scold them for their actions, and on certain occasions can lead to physical harm.  

Haru has a fascination with costumes, which often lead to her changing into different costumes, which often bewilder Tsuna. She is also shown to be able to make dolls with her talented sewing skills.

According to Tsuna and Hayato, Future Haru has become more feminine, but her way of thinking is still the same.

Voice range: med, to med-high
Voice Type: Fast talking, forgetful, clumsy

Reference:
https://youtu.be/Ak8cY6Cd63k?t=22s