The coloring book depicts the Grommel Dragon - one of the funny dragons from the cartoon How to Train Your Dragon. It has a rounded body covered with thorns and a large open mouth filled with sharp teeth, which gives it a formidable appearance. Grommel has small but expressive eyes and large wings that resemble bat wings. This dragon is distinguished by its character and interaction with other characters. His unique appearance and funny facial expression make him a memorable character for children and adults alike.