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The geometric, electronic, magnetic, thermal, and optical properties of transition metal (TM) doped silicene are systematically explored using spin-dependent density functional computation. We find that the TM atoms decrease the buckling degree of the silicene structure caused by the interaction between the dopant TM atoms and the Si atoms in the silicene layer plane which is quite strong. In some TM-silicenes, parallel bands and the corresponding van Hove singularities are observed in the electronic band structure without and with spin-polarization. These parallel bands are the origin of most of the transitions in the visible and the UV regions. A high Seebeck coefficient is found in some TM-silicene without spin-polarization. In the presence of emergent spin-polarization, a reduction or a magnification of the Seebeck coefficient is seen due to a spin-dependent phase transition. We find that the preferred state is a ferromagnetic state with a very high Curie temperature. We observe a strong interaction and large orbital hybridization between the TM atoms and the silicene. As a result, a high magnetic moment emerges in TM-silicene. Our results are potentially beneficial for thermospin, and optoelectronic nanodevices.