He claimed he had no difficulty adapting to the Yogyakarta environment because, according to him, Indonesians have many similarities with Japanese people, such as their staple food, rice.

[2][4] In 2013, together with Shintarō Fukutake, he translated the novel The Rainbow Troops by Andrea Hirata into Japanese with the title 虹の少年たち (Niji no Shо̄nentachi).

[2] In addition, Hiro actively collaborates with other Indonesian musicians, such as Tulus, Kikan Namara, Arda "Naff", and Mike Mohede.

[15] In 2022, Hiro released the song 39 ~Sankyu~ which tells the story of his experience overcoming depression during the COVID-19 pandemic and his gratitude to the people who helped him recover.

[17] Hiroaki Katō married Arina Ephipania Simangunsong, the vocalist of the band Mocca, on February 22, 2019 in Tokyo, Japan.

[18] In June 2023, Hiroaki Katō had the opportunity to meet with the Emperor of Japan, Naruhito, and Empress Masako during their state visit to Indonesia.

During the meeting, Hiro discussed with the Emperor and Empress his reasons for creating songs in three languages: Japanese, Indonesian, and English, as well as his love for Indonesia.