Kyoko Sasagawa (笹川 京子, Sasagawa Kyōko) is the girl that Tsuna admires and has a crush on. She is the sister of the Vongola Sun Guardian, Ryohei Sasagawa. Kyoko is somewhat air headed, not questioning the idea of an infant being in the Mafia and like Yamamoto , probably thinks it is all just a game. Her form is more quiet and polite and not much is known about her true feelings for Tsuna. She dislikes fighting and is always worried for Ryohei.
Daily Life Arc
In the beginning, Kyoko is Tsuna's only reason for coming to school. During the Daily Life Arc, she proceeds to participate in many of Tsuna's wild antics. She has, as of this point in the story, been shot by the Dying Will Bullet twice: the first one was when she played Russian Roulette and the second one was when she ate one of I-Pins gyoza.
Kyoko was not involved in any of the fighting. She does appear during the List Countdown when Ryohei is attacked by Ken . She buys the story that he climbed the chimney to the bathhouse and received a "sprain" when he fell. She also believes Ryohei when he explains to her that the gauze, his broken arm, and missing teeth are all just part of the "sprain"
Kyoko appears once again during this Arc. At the end of Tsuna's flashback due to the Criticism Shot, he hears her being reassured by Ryohei that Tsuna will come back, so she agrees and says she has total faith in him.
Kyoko accepts Ryohei's story that he, along with the rest of Tsuna's family (he doesn't use that term), are just participating in a series of sumo-wrestling matches over the course of the next seven nights. She doesn't like it, but she accepts his reasons for coming home so badly beaten.
Arrival & The Hunt for the StrongestKyoko takes on a much more prominent role in this Arc. She first appears as her Future self, and is blown into one of the warehouse buildings by Nosaru and Tazaru . Tsuna stumbles in, crying, and she is replaced by her younger self. She witnesses Tsuna transform into his Hyper Dying Will Mode, and watches him utilize his Zero Point Breakthrough First Edition to defeat Tazaru. She is escorted back to the Vongola Base along with Haru, Lambo, I-Pin, and Yamamoto by Gokudera and Tsuna.
In the week leading up to the Choice game, Kyoko and Haru demand that Tsuna tell them everything about the Mafia, Byakuran, and the Millefiore. While Bianchi, Futa, Giannini, I-Pin and Reborn support them, Tsuna refuses to admit to them that there was anything worth knowing. So, Kyoko and Haru go on strike by refusing to do any housework while being kept in the dark.
She eventually recants and, on her way to buy groceries to cook food for everyone, she is stopped by Tsuna (who was misled by Bianchi to believe she had run away again). Tsuna realizes on the way to stop her that there is a difference from being kept completely in the dark and knowing there is something that others are refusing to tell a person, so he sits her down and tells her everything. She is then able to offer her opinion as to why Tsuna's Sky Vongola Box was being temperamental, which gives Tsuna a clue on how he needs to open the Box Weapon correctly.
- In the Card Games, Kyoko is shown to have a Mist Flame; however, this has not be confirmed by the creator of the series.
- It's possible that Kyoko has the Sun Flame due to Ryohei being her brother, and he has the Sun Flame. Flames have also shown a tendency to run in the Family.
- Kyoko was held as bait by older kids who wanted to fight Ryohei in the past.
- Ryohei states that to this day, Kyoko thinks boxing is two guys fighting in their underwear with oven mittens on.
- Amano Akira stated once that Kyoko had long hair in kindergarten.
- In the manga, she was shot by the Dying Will Bullet on two different occasions.
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