1.yokai/ninja/onmyouji theme; the rangers were red male tengu, blue male kappa, yellow female neko matta, black male gyuki/ox, and white female kitsune/fox who will protect humans from nurarihyon and his army of evil yokai
their mecha will look like Dairen'oh in which the tengu will be the central component the the rest will be armor
2.olympian theme/constelletion zords and huminoid gods featuring red zeus/dragon, blue Poseidon /hydra, green Hephaestus /lionet,yellow Artemis/Vulpecula, and pink Aphrodite/cygnus and sixth gold apollo/phoenix
the animal constellation mecha will be like Kakure Daishogun, and the humanoid zords will be like invincible
shogun from kakuranger. They who will fight the evil Chronos, Hades;his wife Persephone(who unwillingly is on his side), Aries and the titans
3.Egyptian knight theme: red Horus, female blue Thoth, male yellow Ra, pink Isis and green Sobek;their mecha will be like magiking. They who will fight the god of chaos Set and the goddess of destruction sekhmet and god of death Anubis
4. a Japanese Shinto deity three teamed sentai who gain the powers of red raiden, blue Suijin and yellow fujin. this three man team will revive the other shinto gods and gain their powers to fight against Amatsu-Mikaboshi
if you guess know yugioh i imagine their main mecha to be like gateguradian or they will be in the form of ancient dogs and will resemble GekiTouja