I recently got some Micro Riders, by Banpresto. These are absolutely tiny little figures of Kamen Riders. I picked up 16 of them, all 15 of the Heisei Riders, and the one extra they did to round out the Heisei characters to 16.
I like the packaging of these figures. The cards are about the size of my iPhone, the artwork looks really good, and the figure is easily visible in its little bubble. Shown here with SH Figuarts Gai, for scale.
Closer up view of the 16 I got, all of the Heisei Kamen Riders; Kuuga, Agito, Ryuki, Faiz, Blade, Kabuto, Hibiki, Kiva, Den-O (yes, I always confuse the order of Kiva and Den-O), Decade, Double, OOO, Fourze, Wizard, and Gaim, plus Zangetsu (from Kamen Rider Gaim). Figuarts Kuuga face mask included to remind you of the ridiculously tiny scale these are at.
I think this illustrates well the level of detail in the sculpting and paint that these have. Frankly, I'm pretty impressed with out well these turned out. Each is clearly recognizable, not just by the paint, the bodies are all clearly correctly individualized. Being single, solid pieces, I don't see how they could have reused any of one figure for another, so I'm pretty sure they're all unique sculpts.
Of course, I didn't buy such tiny figures to display on their own, I bought them as props for my FIguarts. They appear to be just about the same scale to a SH Figuarts figure as an SH Figuarts figure does to me, that pleases me greatly.