Monstrenok is a small armless yellow-colored monster with ‘‘spikes‘‘ on its head.
He is wearing a striped yellow-brown poncho and brown boots.
There are also spots under the eyes, and one is slightly larger than the other — perhaps these are bruises from very frequent falls.
The little monster is an innocent, extremely enthusiastic and energetic monster.
He is very inattentive, so very often he stumbles and falls. He also often uses words like "c'mon", "dude" and "yo".
There is an idol - Undyne.