Eclipse is a blue-gray were-wolf with a sea pink crescent moon on her forehead. Her snout, the front of her torso, the end of her tail, and her inner ears are a lighter shade of gray, while the tips of her ears and paws are a dark blue. She wears a black garment with a sea pink trim around her shoulders. In the presence of a Blackout, her pupils become slits, she becomes a little bit taller, her ears become fluffier, and her smile reveals sharp teeth.

Eclipse is very overly excited as seen in her dialogue with Gourdy. She tries to get people more hyped and happy for the next floors. When she's in a Blackout, though, she seems to be more aggressive (as shown with her expression). This is probably due to her werewolf form taking over in Blackouts, making her hunting instincts stronger. It seems her moon glows brighter in Blackouts too, illuminating her path and helping her "hunt down" the Twisteds.