Ohranger was a Egyptian-themed sentai ?

No.

It was more "Ancient Monuments" themed. Ohranger Robo consists of a Moai, Dogu, Sphinx, Bull that represents Greek temples because... and a Phoenix represents the Pyramids because...

And then of course the giant Pyramid is a Giant Pyramid and there's... Whatever Auric was called who was a Tiki.

What you mean with because ?

Which bad guy is your favorite?
My vote is on Bio Hunter Silva because BIO PARTICLE DETECTED DESTROY DESTROY

Prince Junior/Gashadokuro, cause LOOK AT HIM! A Japanese Billy Idol who turns into a chainsaw-wielding camouflage skeleton? It's possible sentai will never top that conceptually. Though, admittedly, he suffers from pretty weak characterization.

I definitely prefer Matoba Jin, Radiguet, Akomaru, Enter, Fuwa Juuzou, and Basco as fully realized characters...

But still. Prince Junior is metal AF.

Kurojishi Rio~
Junior for the above reasons
Shadam is pretty solid, too.

Budo. No if ands or buts my favorite is Budo.

Radiguet, Mele, Jin Matoba, Basco ta Jolokia.

I wish know , how would look like a mecha could reminds me from 80's and 90's ?