Let me put it this way; Kamen Rider is Super Sentai's sister series. What's Super Sentai you ask? Well it's the show that Power Ranges get footage from. That's right; Power Rangers is an American adaptation of Super Sentai

Remember season 2 of Mighty Morphen Power Ranger, and how Tommy came back with a new ranger suit that seemed slightly out of place with the others, well this is why;
[img=http://fc09.deviantart.net/fs71/i/2011/248/e/0/gosei_sentai_dairanger_by_blakehunter-d48xh8j.jpg]
This is also why the black ranger got a green zord

Also, Rain and Rin, just in case your interested;
[hider= FangJoker, FangMetal, FangTrigger][img=http://25.media.tumblr.com/cae30ae57bf3c0956bb623fb8c3b9828/tumblr_mubl429deh1spx46no1_500.jpg][/hider]