The electronic delocalization of different kinds of chemical bonds was then compared by MBO, properties at BCP, and LOL- function. Based on the comprehensive analysis of multiple criteria/methods for evaluating aromaticity including NICS, MCBO, ICSS, ACID, CTOCD-DZ2, and MICD, we confirmed that carborazine has definitely aromatic character like benzene, and its aromaticity is only slightly weaker, while borazine is a rather weakly aromatic species. The atomic charge and PNAO analyses revealed the fact that the C atom between B and N in carborazine behaves as an interconnecting bridge that strengthens the electron delocalization over the conjugated path, which is the essence of the significant enhancement of the molecular aromaticity from borazine to carborazine. Moreover, we also examined several six-membered isoelectronic species of the benzene ring with low symmetry, emphasizing the important influence of the location of the introduced C atoms on aromaticity.