The relevant rules are somewhat scattered throughout both books, so hopefully this will help you keep your Fairy’s quirks and differences from other player characters straight =) I’ve also included a compilation of some of the most relevant rules for Fairies and other Tiny player characters from both the PHB and DMG, to aid in playing a Fairy more effectively.
And thus, I present Fairies, the mischievous defenders of nature! I never wrote it up and polished it, so I decided to remaster it into a full Fairy race with Pixie as a subrace option. About a year or so ago, I created a Pixie homebrew player race.