Platypus, because it makes absolutely no sense as a creature. 
[img]https://cdn1-production-images-kly.akamaized.net/hg6QMFtCKxtg2ivn_8aFAkGaeBs=/1200x675/smart/filters:quality(75):strip_icc():format(jpeg)/kly-media-production/medias/3026642/original/040642900_1579497061-the-platypus-is-one-of-the-world-s-strangest-animals-1579486204831-3.jpg[/img]


Funky lil venomous mammal, I love it so.

Now, what sort of game you played as a kid, but you feel like was very underrated?