All plasmonic nanoparticles possess at least one bright mode, easily tuned by adjusting particle size or length. However, dark modes require more stringent conditions. We identified intragap nanoparticles (Au nanobridged nanogap particles, Au-NNPs) with a well-defined built-in dark mode (Figure ). By anisotropically growing silver onto Au-NNPs to form nanosnowmen, a bright mode can be simultaneously formed and modulated. The resulting nano-Fanowman particle contains distinct bright and dark mode domains (Figure ), both strongly modulated by the Au-Ag junction width (bright mode) and the number of nanobridges at the intragap (dark mode) (Figure ). Consequently, this structure nearly satisfies the conditions required for realising topological Fano resonance.