The calculations performed at the OVGF/6-311++G(3df,3pd)//MP2/6-311++G(d,p) level for the representative NaX2- and AlX4- anions matching the MXk+1- superhalogen formula and utilizing 9-electron systems (i.e., consisting of various possible combinations of atoms containing nine electrons when brought together) revealed that the OH, Li2H3, and NH2 groups might be considered as alternative ligands X due to their thermodynamic stability and large values of electron binding energy (approaching or even exceeding 6 eV in some cases). All aluminum-containing AlX4- anions (excluding Al(HBLi)(4)(-)) were predicted to be thermodynamically stable, whereas the NaX2- anions for X = CH3, HBLi, CLi, BeB, and H2BeLi were found to be susceptible to the fragmentations leading to Na- loss. Among the MXk+1- (M = Na, Al; X = Li2H3, OH, H2BeLi, BeB, NH2, HBLi, CH3, Be2H, CLi) anions utilizing systems containing 9 electrons (and thus isoelectronic with the F atom) the largest vertical electron detachment energy of 6.38 eV was obtained for Al(OH)(4)(-).