The Mysterious Hippopotamus (KATMK)

What is true friendship? To discover the answer, one must set off far, far away - deep into the heart of the jungle, where lies a marvellous land called Miralikundia, a place you won’t find on any map. In this magical country live Leo the Lion Cub, Boris the Hippo, George the Giraffe, Leonid the Sloth, Konstantin the Rabbit, Pavel the Peacock, Masha the Monkey, and Kirill the Crocodile. But who is the mysterious hippopotamus?