Modular controllers for fighting games range in their specifications. However, a common element is that you can modify their usage style on the go.
The X-Move is a sequel to Haute42's modular controller that was nominated for an Evo award, and you can move some of its modules sideways.
The Modulus is a modular controller that allows you to choose its layout and shape from a list of presets or something completely custom.
The Kurtroller is like modular controllers meet LEGO—with many possible colors for its modules that allow you to swap layouts on the go.
With the Meisterbox L, Alpenmeister offers a unique way to play Street Fighter (and other fighting games), such as through a split layout.
The KeebWarrior-S3 is the most ergonomic controller yet, and that is because you can adjust its modules to fit perfectly on your lap.
The Split is divided into two halves connected through a coiled detachable cable—and should be compatible with future modules by Ultra Arcade.
The X1 is Haute42's first attempt at a modular design, with the WASD buttons being rotatable and even replaceable with a joystick!
The Victrix Pro KO features up to 16 moveable buttons in a layout that was optimized by the fighting game veteran, Momochi.