Uncontrollable troublemaker
Laby realize that Nisha is supposed to be her 'sadness' but she refuses to accept that as fact. Laby felt even more emotion towards Nisha who endured all this sadness by herself. If Laby's having fun, Nisha is having fun, and if Laby's happy, Nisha is also happy. So if Laby doesn't feel sad, that means Nisha won't feel sad as well. Laby decides to chase only the most happiest things for Nisha and become a troublemaker dreaming of the two's happy wonderland.