Rupert

Rupert was a Jellie cat owned by Octothorpe. Rupertos Asano in Tanylezi is dedicated to him. Rupert is named after Rupert Peasley, the fictional man depicted reading a book on the album cover of Weezer's Maladroit.
History
Rupert was tamed by Octothorpe in a village in Kīvengṓ. After Octothorpe moved to what is now Tanylezi, they went on a trip to find buried treasure on That One Weirdly Lithuania-Shaped Island with Rupert. Rupert mysteriously disappeared on the voyage back.