There are different types of controllers to play fighting games, and the types range from arcade sticks to leverless controllers (and beyond).
In its outrageous layout, the KBHX-01 MAX+ has 18 keys—most notably including four spacebars with enough surface area for comfy thumb presses.
The STK-T01 is a wireless arcade stick that has 11 main buttons, including a macro button that you can press with your thumb.
You should be able to order Akekon Dojo's Shinpuri regular or large case option with 24 or 30 mm buttons, depending on your hand size.
The Ruby is a wireless controller with a left pinky button and bigger thumb buttons positioned with your fighting game success in mind.
The FightBox R8-J is like the PDP Mortal Kombat Klassic Fight Stick—but with Sanwa parts and a more modern enclosure.
The Battle Grid is an aluminum controller with 13 buttons in a split layout and a bigger screen than usual.
You can buy the Sando in leverless or WASD format, and its uncommon GEON switches have a customizable actuation point.
The TIKITAKA R1A is one of the most customizable controllers that allows you to pick your own layout—as well as the keycap type.