- His Blood Type is O.
- In November 2015, Negi married in his hometown.
- In the Dengeki Comic Grand Prize division of the 21st Dengeki Grand Prize, two people have won gold medals, and the other is Nio Nakatani (Nakatani Nio), who is known for the popular series Bloom Into You (Yagate Kimi ni Naru).
- He has a pet dog named "Gab".
- The first few pages of the first chapter in the Second Year Saga of Go-Toubun no Hanayome, Chapter 1, is about Fuutarou and his bride in their wedding ceremony. The last few pages of the last chapter in the saga, Chapter 68, is also about Fuutarou and his bride in their wedding ceremony.
- According to Haruba, his pen name "Haruba Negi" comes from the protagonist of Negima! Magister Negi Magi, Negi Springfield. On the award ceremony of the 43rd annual Kodansha Manga Awards, Haruba said it was "special to him" to be selected by Akamatsu Ken, who was one of the judges of the award and the creator of Negima! Magister Negi Magi.
- The kanji for Haruba can translate to "spring field.".
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