Read+Write feature:

Unlock exclusive gear / Save favorite weapons, gear, and control settings / Take photos with the character or saved gear

Each figure unlocks its own set of amiibo-exclusive gear. First registering data on the figure in another game like Splatoon 2 or Super Smash Bros. Ultimate will cause it to unlock all its gear in Splatoon 3 immediately. Otherwise it will unlock only one gear piece at a time, and then more pieces after winning some multiplayer battles.

- Inkling Girl (Orange, Lime Green, Smash Bros.): Squid Hairclip, School Uniform A, School Uniform B, School Shoes + Hi Socks, and Base School Shoes
- Inkling Boy (Blue, Purple): Samurai Helmet, Samurai Jacket, and Samurai Shoes
- Inkling Squid (Green, Orange): Power Mask, Power Armor, and Power Boots

- Callie: Hero Headset Replica, Hero Jacket Replica, and Hero Runner Replicas
- Marie: Armor Helmet Replica, Armor Jacket Replica, and Armor Boot Replicas

- Inkling Girl (Neon Pink): Squid Clip-Ons, School Cardigan A, School Cardigan B, and Baggy-Sock Fringe Loafers, and Base Fringed Loafers
- Inkling Boy (Neon Green): Squinja Mask Mk I, Squinja Mask Mk II, Squinja Suit, and Squinja Shoes
- Inkling Squid (Neon Purple): Power Mask Mk I, Power Armor Mk I, and Power Boots Mk I

- Pearl: Pearlescent Crown L, Pearlescent Crown S, Pearlescent Hoodie, and Pearlescent Kicks
- Marina: Marinated Headphones, Marinated Top, and Marinated Slip-Ons

- Octoling Girl: Enchanted Hat, Enchanted Robe A, Enchanted Robe B, and Enchanted Boots
- Octoling Boy: Steel Helm, Steel Platemail, and Steel Greaves
- Octoling Octopus: Fresh Fish Head, Fresh Fish Gloves, and Fresh Fish Feet

- Inkling (Yellow): (Unknown)
- Octoling (Blue): (Unknown)
- Small Fry: (Unknown)