Onku

Onku is a young Earthbending orphan who resides in Grandma Lokai's Earth Orphanage. Not much is known about Onku, apart from that fact that he is quite innocent and enjoys company. Onku refers to everyone as his "friends", and has a hard time letting go of people, as seen when he battles Aang in "Divided We Fall" after he tries 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 is separated by a vicious storm, Onku watches as Aang navigates through the woods. He observes from a distance as Aang defends himself against a colony of Viper-Bats, and shows particular interest after Aang commented on how he must find the others. He pets a Viper-Bat and sets off to find Aang's friends. Not long after, he sees Katara and Sokka climbing up towards Grandma Lokai's Earth Orphanage, and decides to assist them with Earthbending. He then enthusiastically introduces the duo to Grandma Lokai. Katara and Sokka are thrilled to see that Toph is okay, although visibly displeased with what Grandma Lokai put her in. They proceed to laugh, until Grandma Lokai gestures Onku to fetch tights and gowns for the newly arrived guests. Onku happily states that the trio will remain with Grandma Lokai and him forever, and Aang enters stating the contrary. He attacks Onku with an Airbending blast, and Onku is quick to defend himself and his newly found friends. The fight is halted by Katara, who quickly discovers that Onku is an orphan under Grandma Lokai's care. Grandma Lokai apologizes for the confusion, and proceeds to offer the gang Beetle-Worm soup.