Interesting project but as an ordained Buddhist minister in a Japanese lineage I'd like to comment on the Buddhist part of this.
Buddhas are not gods but are called "Teachers of Gods and Men."
Early Buddhism take the early Vedic deities for granted - in particular Brahma as the self-proclaimed creator deity, Sakra Devanam Indra as a thunder god and leader of a group of 32 deities who presided over natural forces, and four heavenly kings who served as generals for Indra whose responsibility was to guard against attempts by the asuras to take back heaven.
Then there are various guardian spirits who are not quite gods and these multiplied greatly as tantric Buddhism developed.
As Buddhism moved into China, Korea, Japan, and later Tibet and other countries it assimilated local deities and/or the various Vedic and tantric deities took on local color.
When you look at Japanese Buddhist iconography you will see a mixture of buddhas, bodhisattvas, Vedic deities, East Asian versions of guardian deities and tantric entities, and local gods who have been adopted into Buddhism.
If I ever get any time I will try to see if I can write up some of these ISG Appendix style, but many categories will be n/a (non-applicable).