PPSSPP

The emulator runs fine. I've had to remap the L/R buttons on my controller as they did not match the default controller config. The d-pad was reversed so I had to make this .yaml file:

version: 1
kind: DeviceProfile
name: D-pad reversal
description: Reverses the D-pad input. Useful for Kazeta for native Linux games.
mapping:
- name: up to down
source_event:
gamepad:
button: DPadUp
target_events:
- gamepad:
button: DPadDown
- name: down to up
source_event:
gamepad:
button: DPadDown
target_events:
- gamepad:
button: DPadUp
- name: left to right
source_event:
gamepad:
button: DPadLeft
target_events:
- gamepad:
button: DPadRight
- name: right to left
source_event:
gamepad:
button: DPadRight
target_events:
- gamepad:
button: DPadLeft

Dissidia 012 Final Fantasy

The game runs fine under PPSSPP. To run mods, I've made a config folder named "PPSSPP-v1.20.4-anylinux-x86_64.AppImage.config" on root of the cartridge where my PPSSPP AppImage was, and launched it beforehand to create the folder structure. I've also had to remap the L/R buttons on my controller as they did not match the default controller config. The d-pad was reversed so I had to make this .yaml file:

version: 1
kind: DeviceProfile
name: D-pad reversal
description: Reverses the D-pad input. Useful for Kazeta for native Linux games.
mapping:
- name: up to down
source_event:
gamepad:
button: DPadUp
target_events:
- gamepad:
button: DPadDown
- name: down to up
source_event:
gamepad:
button: DPadDown
target_events:
- gamepad:
button: DPadUp
- name: left to right
source_event:
gamepad:
button: DPadLeft
target_events:
- gamepad:
button: DPadRight
- name: right to left
source_event:
gamepad:
button: DPadRight
target_events:
- gamepad:
button: DPadLeft

Sonic Adventure 2

Requires the following:
- Goldberg
- Steamless
- the Windows 1.2 runtime, since SA2 requires the waitforexitandrun Proton verb

Only tested with Kazeta+, but it should work with vanilla Kazeta as well.

If you really want to go through the hassle of getting this to work, here's how it goes...

1. Download the game through Steam.
2. Run the game. In the launcher window that opens, make sure Player 1 is set to Controller if you want to use a gamepad.
3. Close the launcher, and copy the game files to another location on your computer.
4. Grab a copy of the Goldberg Steam emulator. Copy the steam_api.dll from the root of the extracted folder and overwrite the existing DLL file in the SA2 game directory.
5. Download Steamless. Unpack the sonic2app.exe binary from the SA2 game directory.
6. A new sonic2app.exe.unpacked.exe will appear next to sonic2app.exe. Remove the old sonic2app.exe file, and rename the new sonic2app.exe.unpacked.exe to sonic2app.exe.
7. To skip the launcher when launching the game, append -q at the end of the Exec= line of your .kzi file.

See this Steam discussion thread for more details.

NFL Quarterback Club 99

The game doesn't run on the Nintendo 64 runtime, but it does run under the Windows release of Gopher64: https://github.com/gopher64/gopher64 (The Linux version doesn't seem to launch at all no matter what I try so feel free to experiment with that.)
You'll need to create an empty text file titled "portable.txt" in the same folder as the Gopher64 executable if you want controller support. Then with a controller plugged into your main PC, launch Gopher64 through Proton (Wine on its own doesn't load the GUI font) and under 'Controller Config' select 'XInput Controller #1'. You can also add controllers to the remaining three players here if you plan on playing the game with others. You can also edit the new "config.json" file in the newly created path '(Name of cartridge)/portable_data/config' manually to force nonexistent players for future-proofing your game.

Lego Party

The Mario Party killer!