A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
The Haute42 V16 Future White has all big buttons, and its LEDs allow you to see it more easily in the dark.
The Haute42 Emotion III-17 has four thumb buttons, a couple of which are pill-shaped, and it has a left pinky button (plus a lanyard loop).
The P12 Pro-Remix is Haute42's third rendition of this controller, and its interpretation of the retro Nintendo aesthetic is quite faithful.
You can order the OKI Hatch Service Deck by JackWagon FightSticks in a lever or leverless format—yet its star feature is its hinged lid.
The Huntsman is a batarang-shaped leverless controller with 12 main buttons—as well as two Hall effect analog sticks.
The Bishop|Select Opal is a more affordable version of the Maestro, and it's ergonomic—but not too ergonomic in a way that's unfamiliar.
The FightBox A10's silent Crown buttons allow you to perform at a high level without giving away your button presses to your nearby opponent.
Consider the Yume Tanuki if you'd like a small leverless controller that still has some decent height to it.