Magic Items. Along with your class, spells, and abilities, they can easily be what defines your character. My bard wouldn't be anywhere near the same if he didn't have his magic guitar. Well, if you're looking for a new set of magic boots or a cape or hat or whatever else, maybe check out The Griffon's Saddlebag, a new magic item compendium that's up on Kickstarter now.
From the campaign:
The Griffon's Saddlebag is a hobby-turned-career passion project that releases new magic items (and other content) for 5th edition every day. This daily content is released on Instagram, Twitter, and Reddit, and is made possible by the support of people like you through Patreon.
This 200+ page book is a compendium of every item made in the Saddlebag's first year, including 365 game-ready, illustrated magic items, 12 new character subclasses, 2 new settings, and an evil villain that can be easily added into your favorite ongoing campaigns. This content is written and designed following the existing standards and precedents set by the official 5e materials to make it easier to read and integrate into your games.
The campaign's more than 14x funded with 29 days left to go.