The Pet Wisp is a small, ethereal creature with a glowing, spherical core that pulses softly with a mystical light. Its body is composed of translucent, wispy tendrils that float and undulate gently around the core, giving it a ghostly appearance. The core emits a subtle, bioluminescent glow in shades of blue or violet, with occasional sparks of energy flickering along its tendrils, enhancing its otherworldly charm.