Laska is the titular character of the story "Laska and Me," a piece of fan fiction written by Bobanon around 2014 that is loosely based on the canon of Monstergirl Encyclopedia (MGE) and also the "threadcannon" of the 4chan/jp based monstergirl threads. She is a young orphan who is adopted by the main character early in the story, and their relationship's development is the primary focus of the story.
Her visual design is directly inspired by MGE's "Cheshire Cat" character. The most obvious difference is Laska's many scars- which she received from her abusive biological mother.
You can read her story here: http://bobanon.pbworks.com/w/page/83050792/Laska%20and%20Me
Contrary to popular belief, Laska the character has noting to do with "less." Less was just an artist that had a fondness for her.