3D printed controllers can be quite charming, and 3D printing controllers often correlates with these controllers being made out of plastic.
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 DoubleSalt is a hitstick with directional buttons that are more slanted than usual, and three of them are smaller than the other buttons.
The RAT-01 is an 11 button fightstick with 24 mm buttons—as well as a handle so you can carry it with ease.
Mini leverless controllers are a dime a dozen, but it's possible to order the NEM Luna with rare MMD Princess switches.
The Caster Portable can fit a Korean-inspired joystick and has more than eight buttons—plus an optional analog stick. What more do you need?
Ionic Impact is Swiss and offers DIY cases in lever & leverless formats, such as the Ionic and Doric Fightstick Cases.
The Kurtroller is like modular controllers meet LEGO—with many possible colors for its modules that allow you to swap layouts on the go.
The VFS-01 has some rare aspects for a fightstick like smaller buttons, a screen, a magnetic opening, and a multicolored design.