A few posters of Ruzka can be spotted scattered around Point Lookout, suggesting that she was a pre-war circus attraction. Now completely feral and ghoulifed, Ruzka amuses herself by playing with a big red ball and the entrails of encroaching swampfolk. She lives in a small alcove at the end of a small inlet channel, and is dangerous and threatening, unless one has the Animal Friend perk.
Ironically, when discussing yao guai, Herbert Dashwood's terminal states that "you're not going to find one of these babies balancing on a big rubber ball, though, I can tell you that much", which is exactly what Ruzka is implied to do.
Ruzka is much larger than the regular yao guai, towering over the Lone Wanderer when she rears on her legs. She is possibly twice the size of a normal yao guai.
Ruzka is the only yao guai that inhabits Point Lookout.