A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
Order your Kombox Impact preassembled with Sanwa buttons or in DIY format, and there is a joystick edition too.
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 Clutch's two most unique aspects are its faster-than-average microswitches and ability to display two colors on top.
The T series of Haute42 controllers comes in 16 or 13 button versions to suit your fighting game preferences.
The Glyph is a modular all-button controller that is available in layouts for games from Smash to Street Fighter.
The Neobox Core0 is a slim acrylic all-button controller that is here in order to serve your need for RGB LEDs.