There are demon-like beings in Buddhism. Mostly they are in the realm of hungry spirits and the lower heavens. These are for example the naga (aquatic serpent demons), yaksha (nature spirits), rakshasa (man-eating demons), pishacha (flesh-eating demons), kimnara (centaurs), asura (warrior gods), mahoraga (subterranean serpent demons).
"If the Buddha-Nature is seen, there will be no seeing of a nature in any thing."
(Nirvana Sutra, T12n374p521b3; tr Yamamoto)
"Neither cultivation nor seated meditation — this is the pure Chan of Tathagata."
(Mazu Daoyi, X1321p3b23; tr. Jinhua Jia)
“Don’t rashly seek the true Buddha;
True Buddha can’t be found.
Does marvelous nature and spirit
Need tempering or refinement?
Mind is this mind carefree;
This face, the face at birth."
(Nanyue Mingzan: Enjoying the Way, tr. Jeff Shore; T2076p461b24-26)