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.