Pseudo-tetrahedral N₃NiX centers are readily prepared from tris(pyrazolyl)borate ligands and halides.  Here X = Cl^-, Br^-, I^- and hydrotris(3,5-dimethyl-1-pyrazolyl)borate (Tp*^-) were used, representing the most extensive series of halides for this sterically less-hindered scorpionate.  Solid Tp*NiX rapidly binds ammonia gas, forming solid [Tp*Ni(NH₃)₃⁺][X^-] at room temperature.  This ammonia uptake is quantitative, and it is reversible with mild heat or vacuum.  Solid [Tp*Ni(NH₃)₃⁺][X^-] are interesting both as precursors to the elusive fluoride (Tp*NiF) in this series and as a basis for potential ammonia sensor/storage materials.  When X = BH₄^-, the stable adduct, Tp*Ni^IIBH₄ has been reported.  Geometry optimizations of fac-(H₃N)₃Ni^IIBH₄⁺ reproduced structural and spectroscopic features of fac-Tp*Ni^IIBH₄.  Because BH₄^- is isostructural with methane, results for Tp*NiBH₄ suggested the possibility of methane activation at a N₃Ni center like fac-Tp*Ni or fac-(H₃N)₃Ni.  Tp*Ni⁺  is proving to be a durable and controllable Lewis acid for the interaction of nickel with hydrogen-rich small molecule substrates.