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This paper discusses morphological variants in the conjugatione of Japanese innovative verbs based on the schema of verbal paradigm. The innovative verbs are classified prescriptively as 5-grade verb (godan verb). We, however, found that the verb ending with /...eru/ can be conjugated as lower monograde verb (shimo ichidan verb) but the verb ending with /...iru/ is rarely conjugated as a upper monograge verb (kami ichidan verb) by investigation NINJAL Web Japanese Corpus (NWJC). And we found that the conjugation of the innovative verbs are affected by phonotactic distributions of monograde verbs, that is, stem final Cs in CV (V = /i, e/) are /k, g, z, t, n, h, b, m, r, (s)/. It was also found that analogy to monograde verbs was related to the token frequency of the source of base. We explained these factors with schemas of verbal paradigm (5-grade verb, lower monograde verb and upper monograge verb) and network relations, which are affacted by frequencies, to innovative verbs.