Navel is a character exclusive to the Pachislot version of Metal Slug 3.
Navel is a young affiliate of the Regular Army often seen having carefree hijinks in the middle of war. She is an active soldier, commanding a personalized SV-001 (which lacks the Vulcans on its sides).
Design-wise she has pink hair and eyes. Her poofy shorts and eared hat are colored orange and she wears googles on her forehead. Navel also has a large red backback, similar to Rumi.