The proper, full title of the series is Ninja, Hero of the Dark. I found the first carded figures at Dollar Tree back in April 2003. However, I remember seeing some of the large boxed sets at a flea market prior to that, sometime in 2002. Big! Lots also carried the line in 2003. There is no copyright date printed on the cards or molded on the figures.
The six figures were given proper names by Chap Mei, although none of those names appear on the individual figure cards.
Note that the weapons and accessories for the same figure varied from the narrow and wide card editions. The wide cards came from Dollar Tree, while Big! Lots carried the narrow version.
While there were vehicles and creatures included in the line, my interest is limited to the figures, so someone else will have to put together a checklist of the accessories. I’ve included the one motorcycle set that I acquired early on, before I found Dual Blade as a single release.
The Ninja Fighter figures were modified, recolored and reissued as Dino Power Ninjatron. In my side-by-side comparisons of the Ninja Fighter and Dino Power figures, I’ve made no attempt to show all the separate weapons and accessories as these varied greatly between the different package sizes. For the same reason these are not included in the lists of separate pieces. However, separately molded bits, such as holsters and weapons that are glued onto arms and legs, are included.
Hah, this is one of those threads that I made and can't believe I didn't put any more info in. Sadly I haven't seen any good catalog pics for this line and for Dino Power Ninjatron they're also sorely missing. Two of Chap Mei's coolest lines to be sure.