Porkins is a Yorkshire pig and is one of the known animal internet celebrities. They were only seen at a Meme-Con stand attempting to sign books, presumably their own. They're seen wearing what appears to be a flower crown made up of Gerbera Daisies.
Porkins is also seen accompanied by a blond human girl who is likely their owner and/or trainer and was only seen in "Viral Video".
Gluten-cat is a Meme-Con judge, sitting alongside the Balancing Lizard and Nom Nom. It also appears to be an orange-and-white tabby cat. Just like the Balancing Lizard, Gluten-cat was only seen in their debut in "Viral Video"
Gluten-cat is a reference to the meme known as cat breading which involves placing pieces of bread around cats' heads.
The Balancing Lizard is another one of the three Meme-Con judges. This lizard mostly resembles the Pogona Vitticeps, bearded dragon, and can even be seen balancing most fruits that are part of its diet.
The Balancing Lizard references the internet trend of people balancing as many small fruits as they can on the heads of lizards.
Liz is a homeless pigeon with one leg. She attended Meme-Con as a contestant in "Viral Video". Her special talent is tap dancing. Her owner and trainer is a homeless man; both of whom live in the dump.
The small rodent was eventually removed from the cave after Grizzly crashed into the roof from a tree and a fireman came to rescue them. Ice Bear handed the fireman the mouse who proceeded to take it to safety.
The mouse reappears again in "Vacation."