Hanasato Minori: Fellow group member and friend. Haruka values Minori as a friend, but initially feels as though their relationship is complicated due to Minori's fascination of Haruka's idol self. She is deeply grateful towards Minori for helping her rediscover the desire to be an idol once more. Haruka is also shown to be very appreciative of Minori's later efforts on getting to know more about Haruka's non-idol self.[1]
Momoi Airi: Fellow group member and friend. Haruka thinks Airi is undervalued in the idol world. Before the main story, Haruka had seen Airi perform on a short segment for a show, and she immediately left an impression on her due to her work ethic and dedication. In the Happy Lovely Everyday! event, Haruka got concerned for Airi, and decided to give her a section to herself in the show in order to prove to her that she’s liked for more than just Happy Everyday.
Hinomori Shizuku: Fellow group member. As ASRUN and Cheerful*Days members, they had performed together prior to forming MORE MORE JUMP!, and during their first meeting, Haruka comforted Shizuku and complimented her for working harder than anyone else in the group.[2] Haruka appreciates her hard work and encourages her to be her imperfect, more authentic self to their fans.
Hoshino Ichika: Friends following the Miyamasuzaka Sports Festival event. Haruka appreciates Ichika for treating her like a normal person. The two were also classmates in Class 1-C during their first year.
Tenma Saki: Friends following the Miyamasuzaka Sports Festival event. Just like Ichika, Saki treats Haruka like a normal person, which makes her happy. The two were also classmates in Class 1-C during their first year.
Hinomori Shiho: Friends following the Miyamasuzaka Sports Festival event. They later interact more in the A Gentleman Thief's Thrilling White Day?! event where they decide to go together to the chocolate factory. They also have a shared love for mascot characters.
Azusawa Kohane: Friends following the Time to hang out♪ event. Haruka enjoys teasing her.
Shiraishi An: Childhood friends since elementary school. Haruka was competitive and often competed with An in silly contests, like who could run faster or who could eat their entire lunch first.[3] However, they were separated when Haruka went to Miyamasuzaka and An to Kamiyama High School. They still hang out together outside of school.
Otori Emu: Friends whom first officially meet through the Sports Festival Executive Committee during one of the planning sessions for the Festival, though Haruka had heard about Emu prior to this. When Emu expresses her desire to make the Sports Festival an event that leaves people motivated even when it's over, Haruka is reminded of Minori and her determination to bring hope to people. This similarity is what prompts Haruka to offer her support and help to Emu, to which the latter is grateful. From there they become good friends, both promising to continue doing their best together at the end of the Sports Festival.
Akiyama Mizuki: Acquaintances through An.
Hatsune Miku: VIRTUAL SINGER and friend.
Kagamine Rin: VIRTUAL SINGER and friend.
Kagamine Len: VIRTUAL SINGER and friend.
Megurine Luka: VIRTUAL SINGER and friend.
MEIKO: VIRTUAL SINGER and friend.
KAITO: VIRTUAL SINGER and friend.
Mai: Haruka's former groupmate from ASRUN. While their relationship had become somewhat turbulent as a result of Mai's breakdown and Haruka stepping down from ASRUN, which led to it disbanding, the two eventually reconciled.