Zygarde 50% Forme has a serpentine body with green and black markings. Most of its back, head, and neck are black, while the underbelly and the tip of its tail are green. Its eyes are made of four green hexagons, similar to an insect with compound eyes, and there is a thin, white line down the center of its face. Across the back of its neck is a large frill made of five long, flat protrusions that each have two small, green hexagons on them. There are three short tendrils on either side of its chest; they are black on the right and green on the left. Its tail also ends in five tendrils. It has many small, green hexagon markings on its body capable of glowing. This form of Zygarde is thought to monitor those who destroy the ecosystem from deep with its cave. Should the region's ecosystem fall into disarray, it will appear and reveal its power.