The Varmilo FK2 is a 14 button controller that also comes in differently colored Sea Melody and Sakura editions.
The Mu-1612 is a 15 button stickless controller made of aluminum, and it features a split PCB layout for modular upgrades.
The Slab Keys is a mini WASD controller handmade by Arcade PCBs that is comprised of a sandwich acrylic case.
The FS-MINI by Tbox is a mini controller that is available in lever and leverless editions. It can also come in preassembled or DIY formats.
You can choose the color of the small & light KBGM-H06M, which also features LED for its buttons and midsection.
The Mayflash F700 Elite is a wireless arcade stick with Sanwa parts, customizable art, and many compatibility options.
The KBGM-H08 has Sanwa parts, and it allows you to pick the colors of its joystick, buttons, top, and bottom.
The LightFox (or Light Fighting Box) is a feature-packed mini leverless controller that refreshingly comes with optical switches.