The outside of a pawpaw fruit is sort of leathery yellow-green-brown with lots of brown spots. The inside is creamy yellow with huge black seeds, easily removed. The texture is a bit like avocado crossed with banana, ranging from relatively firm to very mooshy/squishy, and the flavor is... hmm... kind of like banana-pear with a hint of lemon, maybe? Or mango-guava-banana? Hard to describe, anyway. It's very sweet and gets cloying rather quickly; one fruit would probably be most people's limit.
It turns out that I am mildly allergic to raw pawpaws, but not terribly so -- a single Benadryl tablet was enough to mitigate the reaction, and I didn't start getting excessive phlegm/throat-closing issues until I'd eaten nearly a whole palm-sized fruit.
I don't particularly need to eat another pawpaw ever again, but I hear they make pretty good ice cream (which I would readily believe) and they can be subbed into almost any recipe in place of banana. Miss Cactus said she used a bunch in a banana bread recipe this week and it turned out well, so. :)