When seen by Buddhist image, Yakushi Nyorai, Kannon Bosatsu, and Fudo Myoo are more likely to be treated as Hibutsu; in general, Buddhist images worshipped at Esoteric Buddhism temples tend to be treated as hibutsu (Yakushi Nyorai, which is an exoteric Buddha, is often worshipped as the principle god of esoteric temples).
像種別には薬師如来、観音菩薩、不動明王に秘仏となっているものが比較的多く、秘仏は総じて密教系の仏に多いということが言える（薬師如来は顕教系の仏だが密教寺院で本尊とされることが多い）。