Android 10 here. Black (very dark / no light) character here too.  Frame rate is reasonable, though.

Changing the display brightness (screen backlight) to max before launching doesn't help.

Turning off Auto-Brightness before launching doesn't help.

For the record, I get solid 45 fps on max visual settings in Eve Echoes and Diablo Immortal on this device, and no lighting issues.

On my PC lighting is fine.