From Homestar Runner Wiki
Nibbles is a mini-marshmallow and the mascot for Fluffy Puff Bite-Size Nibblers. He is very small compared to Marshie, and has a swirl on top of his head. He claims to be "one years old." Not only is Nibbles a sugary confection, he supposedly makes good earplugs, too. The existence of Nibbles raises the ire of Fluffy Puff's established mascot, Marshie, causing him to scream "get out of here, you little runt!" at the diminutive confection. Nibbles' walking sound is the same sound that Homsar and Mr. Shmallow make.
Prior to Nibbles' debut on the website, Mike referred to him as "a Nermal to Marshie's Garfield" at the NYU Talk. Mike stated that Marshie hates Nibbles and explained that he is much cuter than his regular-sized counterpart. Matt provided the voice for Marshie and exclaimed that Nibbles is "trying to take [his] job!". This utterance may explain the animosity he has towards Nibbles.
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