Bumi and Avatar Aang shared a deep friendship. They were childhood friends, and although Aang disappeared for a hundred years, their bond remained intact when they met each other again, despite Aang still being a child and Bumi an elder. Bumi was described by Aang as a 'mad genius' and a 'great leader', who played a significant role in ending the Hundred Year War. Aang and his wife Katara even named their first son Bumi, further highlighting the importance of their relationship.