[henshinzero]

1) Dinosaur rider series
- Style of Hulk & Tarzan
- Key Item: Fossils
- # of riders: Main hero - Dinosaur rider (Allosaurus, Brachiosaurus, Triceratops, Pterodactyl, Plesiosaurus, Stegosaurus) & secondary rider - Extinct beast rider (ex. Smilodon, Mastodon, Doedicurus). Dark rider (Tyrannosaurus, Brontosaurus, Styracosaurus & Rhamphorynchus)

2) Dark Monster hunter rider series
- Style of Castlevania, Devil May Cry & Darkstalkers
- Key Item: Keys (Ryukendo style)
- # of riders: Main hero - monster hunter rider (Vampire, Werewolf, Merman, Mummy, Frankenstein, Archangel - final form)

The ninja rider series. Well the villains in it should be yokai that turn humans into yokai-like oni with dark chi masks.