There are Ghasts, big white floating squid which can hurl boulders at you like a cannon, Darth Creepers, which act like regular creepers, but they can pass through solid blocks to get to you, zombie pigmen who are neutral unless you attack them, in which case they'll join your side and act as your ally and help you fight creepers and ghasts.
Also, if you find a big pool of lava and jump into it, you can occasionally find these things, though you'll likely die in the process:
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Go and see for yourself, or look at the Wiki.
Also, if you find a big pool of lava and jump into it, you can occasionally find these things, though you'll likely die in the process:
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