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Bronzor aside I think the urban legend of Bloody Mary would make for an interesting mirror Pokemon. Like the first stage is some humanoid face staring out of a mirror, then the second stage has it burst out of the the mirror with shards of glass embedded in it.
Other things:
-Wendigo(Icy Cannabalistic spirits, Ice/Dark?, pictured)
-Sequoia(MASSIVE trees, might make for a good Grass/Fairy(giants)
-Manchineel(Another tree, this time its an apple tree where EVERYTHING on it is poisonous to some degree)
-Joybuzzers(Electric/FIghting actively trying to smack people, or Electric/Dark doing it more sneakily.)