Ponygon was named by Kiyo because Ponygon was unable to speak his real name, which is Schneider. He looks like a donkey or a small horse. He is friends with Zatch and is more then often seen in the show getting into some kind of trouble. So far he has been seen falling off a makeshift sled that Zatch used to get to Kiyo's summer camp, getting chased by a bullying girl in the park, coming out of the airport luggage conveyor belt, among many other scenarios.

For the longest time, Ponygon had no partner, and was always trying to get people to look at his book. Kiyo didn't like Ponygon at first since he found him annoying... though he had good reason, as Ponygon always bit his hand. Ponygon got angry when Kiyo cut the rope Ponygon used to carry his book on his back since his mother made the rope. However, when Ponygon tried to tell him that, since all he made were noises that nobody can understand, Kiyo had no clue what he was saying.

Kiyo soon learned that Ponygon was befriending all of his friends since he was looking for a partner. He was a Mamodo, like Zatch. None of Kiyo friends had Mamodo's, which is why he kept wanting to hang around, but Kiyo was already Zatch's human partner, so Ponygon felt no need to befriend Kiyo.