Graffiti Monsters

Graffiti Monsters are the name of graffiti came to life in Under the Hood

Head-Spider
The Head-Spider appears as a green head with a 4'o Clock shadow, empty eyesockets, and four purple, long spider legs coming out of the sides of it.

Bat-Zipper
The Bat-Zipper appears as a zipper and when it opens it appears as a mouth, and it has two bats wings on the sides.

Handed Creature
The Handed Creature appears as a red creature with a body that looks similar to a Pirahna Plant's from the Super Mario series. It has a mouth in the front of the body. It has 2, giant red hands that can grab stuff.

Trivia

 * They are some of the undefeated enemies. The first one was the Moon Monster.