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Just ... thinking about Final Fantasy 1's enemy sprites
(hexbear.net)
These are just like, the most important bosses. A lot of the regular enemy sprites are so nice too. Like just, what they did with such limited hardware. So nice.
In terms of, like, the NES rendering, the enemies and bosses in FF1 are rendered on the background layer. Colloquially, people tend to call any chunk of pixel art a sprite.