Though Taichi doesn't speak much, he's very sympathetic towards others and wants to help his friends when they're having trouble. He suddenly becomes passionate when he starts talking about his hobby, pro-wrestling, and Inaba stops him when he tries to add wrestling topics to their Cultural Research Club's newspaper. He has a little sister in elementary school, Rina. He begins to date Inaba in volume 4. Taichi and Inaba have described their relationship as soul mates and have even tried on rings together during a date. (Source: ANN)
The sentient that is responsible for the body-swapping phenomenon, he normally takes over the body of Gotou Ryuuzen. He is not limited to possessing only Gotou, as he was able to possess Cultural club members without difficulty. He wishes to be entertained. He picks the Student Cultural Society club members of the Yamaboshi Private High School, just because he thought they are an interesting bunch. He has control over the Body-swapping phenomenon, capable of taking over anybody he wishes. He can start and end the body-swapping process; however he allows the body-swapping to randomly choose the candidates amongst the group as it will be more interesting. He is also capable of letting the candidates choose who they wish to body-swap with among themselves, but only when he desires it. (Source: Kokoro Connect Wikia)
Homeroom teacher of the Cultural Research Club members, and the advisor for the club itself. Also serves as a host for Heartseed, who occasionally takes control of Gotou's body to explain a phenomenon to the club. Afterwards, Gotou has no recollection of what happened at those times.
Taichi's elementary school age younger sister. She often gives advice to her brother about love. Like Ryuuzen and Iori, she is sometimes controlled by Heartseed, but the different one from Heartseed the cultural club's members known.
Birthday: May 27 Zodiac: Gemini Blood type: O Height: 176 cm Weight: 58 kg Best subject: Social Studies Worst subject: Classic Literature Favorite food: chicken nanban Least favorite food: celery Favorite musician: Dave Matthews Band Siblings: one elder brother First love: 1st year of middle school Usual snack: potato chips Favorite beverage: coffee Favorite colors: blue & black Other: His hair is part naturally messy, part perm. Kou was well liked in middle-school, he liked Futaba and they had a growing relationship, but then he suddenly moved away in the middle of the school year. His parents divorced and he now lives with his father (presumably he first lived with his mother after the divorce, but when starting high school he moved in with his father instead, for unknown reasons). He is currently attending the same high school as Futaba under a new last name (probably his mother's). He eventually admits to being "Tanaka-kun," and while acting cold and uncaring toward her most of the time, his nice side becomes gradually more prominent. It's revealed that he moved away to live with his mother due to his parent's divorce. His mother's later terminal illness, caused him terrible grief and trauma, eventually resulting in his change of personality.
Birthday: June 19 Zodiac sign: Gemini Blood type: A Height: 160 cm Weight: 50 kg Best subject: Science Worst subject: English Favorite food: Tarako pasta Least favorite food: Milk Favorite musician: Abe Mao First love: 1st year of middle school Usual snack: Garbo ball Favorite beverage: Tea Favorite color: White Other: Her bedroom is actually really girly. Futaba often shied away from boys, writing them off as crude, rough, and vulgar all except the mild-voiced, small-built, Kou. They shared a brief attraction to each other. One day, Kou suddenly moved away without any notice leaving behind a stunned Futaba. Futaba's life took a drastic turn after Kou's departure—the other boys started to take notice of Futaba's flawless face, alienating her from the rest of the girls. They began to hate Futaba and blame her eventually exiling her all together. Now in high school, Futaba is determined to not be too girly in order to avoid a repetition of what happened in her middle school years. When she confesses to Kou, she is rejected. Touma confesses to her even after knowing that she loves Kou. She starts dating him when he says that he won't give up and will definitely make her fall in love with him. The reason that she started dating was so that she could forget her feelings for Kou. Later when Kou realises that he can never love anyone else but Futaba, he goes after her even though he knows that she is dating Touma. She also comes to terms to her real feelings that she loves only Kou. She breaks up with Touma and starts dating Kou. At times she is even shown to be too obsessive about Kou that she tells she wants to see his all types of faces like when crying or smiling or blushing. She even tells that she wants him also to be the same for her.