A WASD controller often has a combination of WASD keys on the left and arcade buttons on the right. Of course, there can be other variations as well.
The Haute42 S16 is a small & slim stickless controller with more buttons than usual, and the S13 edition has less buttons.
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.
The Haute42 M16 can also be a WASD controller. As for the M13 edition, it has three less buttons than the M16.
If there's a most innovative award, the JTechWorkshop would definitely be a contender. Its leverless controllers have highly custom layouts.
The Punk Workshop Leverless U provides a plethora of features, such as slimness, many layouts, different colors, and custom art.
The T series of Haute42 controllers comes in 16 or 13 button versions to suit your fighting game preferences.
The G series of Haute42 controllers can come in 16, 13, or 12 button editions in order to cater to your needs.