A side-profile close-up of a sleek, black stealth mecha resembling a futuristic ninja. The visor glows a shifting emerald hue, pulsing softly through the mist. Subtle neon lines trace along the armor and flicker in rhythm, emphasizing stealth and danger. The glowing eye light dynamically intensifies and fades, giving a lifelike aura. Perfect for a mysterious motion wallpaper with fog and shadows.