Obviously that's just the class chuuni that got his face scratched by a cat, he doesn't even have the eye patch over the injured eye. Also, he just forgot to shave that day.
It is a (female) elf from a webcomic that it is being published semiregurlaly in the comics subreddit. Whether the comic is good or not is up for debate, but her off-model reactions have become memes of their own.
I mean, realistically speaking, there wouldn't be any animals alive on the island if there was no source of fresh water. They probably just need to look more.