Onku

Onku was a young Earthbending orphan who resided in Grandma Lokai's Earth Orphanage. Not much is known about Onku, apart from that fact that he was quite innocent and enjoyed company. Onku referred to everyone as his "friends", and had a hard time letting go of people, as seen when he battled Aang after he tried to take Toph, Sokka, and Katara away. This reluctance to let go may be due to him losing his parents at a young age.

History
After Team Avatar was separated by a vicious storm, Onku watched as Aang navigated through the woods. He observed from a distance as Aang defended himself against a colony of viper-bats, and showed particular interest after Aang commented on how he must find the others. He petted a viper-bat and set off to find Aang's friends. Not long after, he saw Katara and Sokka climbing up towards Grandma Lokai's Earth Orphanage, and decided to assist them with Earthbending. He then enthusiastically introduced the duo to Grandma Lokai. Katara and Sokka were thrilled to see that Toph was okay, although visibly displeased with the outfit Grandma Lokai put her in. They proceeded to laugh, until Grandma Lokai gestured Onku to fetch tights and gowns for the newly arrived guests. Onku happily stated that the trio will remain with Grandma Lokai and him forever, and Aang entered stating the contrary. He attacked Onku with an Airbending blast, and Onku was quick to defend himself and his newly found friends. The fight was halted by Katara, who quickly discovered that Onku was an orphan under Grandma Lokai's care. Grandma Lokai apologized for the confusion, and proceeded to offer the gang Beetle-Worm soup.

His ultimate fate after the War is unknown.