Grendel is a massive, organic-looking Warframe with a bulbous, rounded body that emphasizes his gluttonous theme. His armor features thick, layered plating resembling muscle and fat folds, with a smooth, slightly glossy finish that suggests a rubbery or fleshy material. Distinctive design elements include a gaping mouth-like opening on his chest and stomach area, surrounded by rib-like armor segments, and his helmet resembles a grotesque, grinning mask with glowing eyes. The color scheme typically includes deep greens and browns, with areas of glowing energy highlighting his mouth and eyes, suggesting a voracious, insatiable nature.