[Den-O]

Drag Redder is from Kamen Rider Ryuki. He's the contract monster for the title character. As for the foodroids those come from Kamen Rider Fourze. But the last 3 Rider series have had the same types of robots. W had memory gadgets, OOO had Candroids, now Fourze has Foodroids. Id say a good basic show to star with is Kuuga or Agito but if you want something a little more recent I highly recommend W and Decade. W has a great noir feel to it and Decade gives brief introductions to a lot of previous series. It was my first experience and I've been hooked since.