It’s actually local culture/teachings intertwined with Buddhism.
Hindu-Buddhist culture spread from South Asia to southeast and east Asia. There were multiple waves of spreading. Buddhism rejected the Hindu/Vedic deities originally, so let’s say there was first a Buddhist wave spread in east and southeast Asia which didn’t revere the Hindu gods. Later though, another wave of Hinduism spread too so the Buddhists from there adopted Hindu deities and it became a syncretic culture of local customs + Hinduism + Buddhism.
Thus there are differences as well as similarities if we compare Chinese (or Japanese) Buddhism vs Indian Buddhism.
For example this deity is originally a Hindu goddess Saraswati, but with the Japanese name and got intertwined with the Buddhism of Japan.
I revere her myself as she’s the goddess of knowledge. I have mentioned her in my post.
There’s also Japanese version of Ganesha (elephant headed God) and Yama (God of death and justice, and one of my beloved)