The Vindolf Hobgblin was a monster hiding in June's middle-school, sought out by Thor to be banished or destroyed as otherwise it would have unleashed chaos and destruction on the human world. With the help of his valkyries, Thor was even ready to tear down the middle-school, kids in it or not, to find it.
In it's smaller state, it looks like a purple furry rodent. In it's released form, it first grows three heads and can grow more heads from lethal hits to it's original heads as well as spit fire. In the end it was taken down by Thor with the smart thinking of June to subdue it's multiple heads.
It appears in Citizen June.