The Pinebox is a stickless controller that is made of pinewood and is also available in a Super Smash Bros layout.
The Stress Pocket Arcade Fight Pad is a mini WASD controller with unusual angles that may appeal to you more than the usual layout.
The RTU-A4 is a fantastic variant of the RTU for those who would like more wrist resting space, lap play comfort, and so on.
The RTU is a slim 1" mini hitbox with Cherry MX or Glorious Pandas switches that you can customize the button colors of.
The Atachon TURBO mini hitbox is handmade in Poland with acrylic, has Punk Workshop LED buttons, and can accept custom artwork.
This mini all-keys controller made of aluminum and acrylic can be ordered in hitbox or WASD formats with various switches.
The 4TW cast-acrylic case by jonyfraze can be ordered in preassembled or DIY formats as well as different layouts and art.
The Panzer Fight Stick 4 by Jasen's Customs is the latest installment in the beloved indie fightstick line.