Kurogane
http://srwog.velv.net/mecha_images/kurogane.png

No hotlinking from that site, bro. You gotta host it on your own or find a different source.
"But I can see it just fine."
I know you can see it. The rest of us can't, however.

Maybe a Zodiac Sentai could work. But only with an Abaranger/Gekiranger sized team.

The season would have a four member team. Each member represents a sign from one of three groupings. So if Toei chose "cardinal," the team would be Aries, Cancer, Libra and Capricorn. Accesory mecha would be from another grouping, say, "fixed," so Taurus, Leo, Scorpio and Aquarius. The mid-season upgrades would then be the remaining "mutable," Gemini, Virgo, Sagittarius, and Pisces. And the sixth ranger would be Ophiuchus.