Available exclusively at GameStop is this 'Bonus Mystery Guardian Keychain'. As you'd expect, this is a 'while supplies last' kind of deal, so make sure to go and get your order in if you're particularly keen on picking one up.
Of course, you'll also benefit from a pre-order bonus if you choose to buy the game digitally; Nintendo recently revealed that any orders made on the Switch eShop will give you access to a Lucky Ladle item that Link can use in-game. Not quite the same as a cute keychain to display at home, but better than nothing.
Remember that more details on Hyrule Warriors: Age of Calamity will be shared in a Nintendo Treehouse: Live presentation later today. Keep an eye on our homepage from just before 10am PDT / 1pm EDT / 6pm BST / 7pm CEST to watch it live.
Please note that some external links on this page are affiliate links, which means if you click them and make a purchase we may receive a small percentage of the sale. Please read our FTC Disclosure for more information.