The character styles of the Great Mandala for Honzon designated by various schools of the Nichiren sect all show similarity to Bonji (Siddham characters), which is a major characteristic of the Shingon sect.
日蓮宗系各宗派の立てる本尊である大曼荼羅の字体は、真言宗自家薬籠中の梵字（悉曇文字）への近接が窺われる。