Matter-Eater Lad (real name Tenzil Kem) is a member of the Legion of Super-Heroes and possesses the power to eat matter in all forms, as do all natives of his home planet, Bismoll. He first appears in Adventure Comics #303, (December 1963).
The BG is from the art of Pacific Rim. What a great film that is btw.
Don't forget to brush your teeth.