A good buddy of mine in my old 1e group absolutely
loved the FF, right down to the last horn-y bunny, bobble-headed mort. That was
his book. So every once in a while when I'd hand over the DMing reins to him, he'd repopulate entire dungeons with obscure FF monsters. And I
distinctly remember our party being nearly TPK'd by an encounter with these Newman's. Actually, my fighter/thief
did buy it in that fight IIRC, because one could figure out how to hurt them (and having fire-happy magic user certainly helped to speed up our demise).