Here's what I know. If you lose general weight eventually you can reduce the double chin. Also you can tone the muscles under your chin by doing stretches periodically (I believe if you stand straight up against a wall and tilt your head up).
When in doubt: Duct tape it.
Giant Diglett will return!
Possible Future Cosplays:
-Zapdos Original design (humanoid)
-Unown Original design (humanoid)
-Marika Kato - Pirate Captain