I've been working on my spin on the henshin hero concept. I must admit it does have quite a few similiarities to Guyver, but hey it's one of my faves. Sort of Guyver meets Ultraman but with a darker tone. I'm passing feedback onto my artist, care to see some of the monsters and a rough sketch of the main character.
Main here, rough, first thing I told her was 'anime atonomy', he'll have a more skeleton colored flesh and fight better at night. No energy attacks like Ultra, more of a savage melee fighter.
http://yfrog.com/07project007j
One giant monster, Barultan.
http://yfrog.com/58project005j
Another, Largis.
http://img195.imageshack.us/img195/8895/project006.jpg