The Masamune in Rocket League Sideswipe is a sleek, futuristic car with a vibrant, cartoonish design. It features a low-profile body with smooth, aerodynamic curves and angular accents, giving it a high-speed appearance. The car's surface is polished with a glossy finish, showcasing bright, metallic colors and optional decals that can be customized. Distinctive design elements include a sharp front splitter, side vents, and a rear spoiler, all contributing to its aggressive yet stylish look.