The following is a version of Redshrike's RPG enemy collection modified to follow the NES' graphical capabilities as closely as possible. Some were recolored a little bit to fit easier, others only had minimal color changes.
Technical info:
* The tiles are intended for a use on a solid black background,
* The tiles are alinged in a 16x16 grid, which is supposed to represent an attribute table grid. As a result of that, the enemies are not aligned (vertically or horizontally) with each other.
* As the NES only allows for 4 colors, including the BG color (black here) on a background layer in a single 16x16 block, some colors will have to be displayed with sprites instead. Such colors, as well as the amount of sprites required, is noted along the image. In areas where background palettes are not obvious, the black is replaced with a different color.
* On a true NES, a selection of enemies used in one encounter will be limited, as it only allows for 4 background palettes and 4 sprite ones (and one of both will probably be used for the interface).
Comments
I like it! I'm pretty impressed with how you've managed to maintain the overall look within the restrictions.
It's not as much about restrictions, as it is about limiting which enemies would appear at one time. For example, the gnu (#12) uses 3 different BG palettes and 15 sprites -- which would make it impossible for other enemies to appear on the screen. The bee (#15) and the ghost (#3) use 2 different BG palettes -- so they would either appear in groups or along with some other simple enemy (such as a bat (#2)). (In fact, as a bee uses three sprite palettes, and the fourth one would probably belong to the interface, it would be impossible to use it in a group with any other enemy using sprites -- only those labeled "no extra" would be allowed.)