A mini arcade controller is often so small that there is little to no wrist resting space, but the tradeoff is that you get something portable and so on.
The Haute42 B16 is a larger version of the Haute Board Mini, and this time, it also has more keys, giving it a dual layout.
The Mini•Dub is a smaller version of the 4TW by jonyfraze, and the primary difference is how the edges are mostly straight.
Chibico by Acrycade Gear is a mini stickless controller that should be able to fit into a back pocket of a pair of pants.
The Hori Fighting Stick Mini is an average mini fightstick that might catch your eye in the sea of competitors.
The QRD Maestro S3 can either work wirelessly or with a wired connection, depending on your preference when you play.
The Skullbox Leverless Arcade Controller is smaller & thinner than average and has proprietary SkullCaps that mimic the Sanwa feel.
With the KBHX-01, you get a mini WASD controller available in different colors and can even work on the PS5 with a dongle.
The KBHX-02 could very well be the first fighting game controller with ventilation in the history of humankind.