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.