What the numbers say (measured on these frames)
| level | fighter vs scene | outline contrast | scene brightness |
|---|---|---|---|
| off | 40.8 | 3.4 | 66 |
| 35% (today) | 42.2 | 1.8 | 47 |
| 65% | 46.6 | 1.4 | 35 |
| 90% | 49.2 | 1.4 | 26 |
| 100% | 50.4 | 1.45 | 23 |
The fighters' colours actually stand out more the darker it gets. But the black ink outlines (and dark things like guns on the floor) blend into the dark scene.
Edge cases I'd fix with a dark default
- Guns and items on the floor are dark grey. At night they get a soft glow and a rim light so you can still spot them.
- On a phone in sunlight, or at low screen brightness, 100% is very dark. The Settings slider stays, so players can lighten it.
- Players who already changed the slider keep their own value. Only new installs (and people still on the old default) move.
- Wi-Fi rooms: the host's NIGHT preset (PLAYER / DAY / DUSK / NIGHT / DEEP) still wins. PLAYER = each phone's own setting.
My recommendation
Go with what you asked: 100%, plus the glow on floor items (above). If 100% looks too heavy on the castle / rooftops rows, 90% (the DEEP preset) is the nearest step back.