My favorite fantasy RPG is Tunnels and Trolls. It is a quirky game based on a simple set of rules. It only requires 6 sided dice, so all you have to do is scrounge through some board games and Yahtzee sets to play. The list of playable species is crazy. Leprechauns and fairies are considered playable, and it is just as easy to play a dragon, tiger, or ape-man as long as you get GM approval.
One bonus of T&T is that it has long been supported by solitaire modules, allowing you to run your character if you don’t have a group. The rules have their idiosyncrasies but they also encourage you to make your own rules. I love the gonzo and DIY ethos of the game. If you have never tried it, the new deluxe edition is out now. You can also try out the system for free with this quickstart.