Urchin

Urchin can refer to the stages:
 * Starfish Mainstage, named after sea urchins in German, Japanese, and Spanish
 * Urchin Underpass

Or the characters:
 * Spyke
 * Murch
 * Kitamura, drummer of Ink Theory
 * Murasaki, drummer of Squid Squad and Front Roe
 * Oonie, bassist of Ink Theory

Or the gear: