There are different types of controllers to play fighting games, and the types range from arcade sticks to leverless controllers (and beyond).
Cubs made a hybrid, the Cubstraption, that has a GameCube controller on the left and half of a box controller on the right.
The translucently white housing of this controller by CHIYODA Freaks exhibits sparkling reflections in an aesthetically pleasing way.
It seems that DOIO took its creative liberties with the spacing of the KBGM-H03's buttons, especially the uppermost button.
The Mini•Dub is a smaller version of the 4TW by jonyfraze, and the primary difference is how the edges are mostly straight.
The VM6R offers multiple layouts and can be ordered as a case or preassembled. It also features both Iris and Lolli tech.
Chibico by Acrycade Gear is a mini stickless controller that should be able to fit into a back pocket of a pair of pants.
The Joytron EX Revolution Air is most recommended for Tekken players who'd like to enjoy playing wirelessly.
The Hori Fighting Stick Mini is an average mini fightstick that might catch your eye in the sea of competitors.