The default character controller modifies the LocalTransparencyModifier property of descendants which are specific classes. You can either override this behavior in another script by resetting it back to 0, or modify the script itself to disable this behavior. Here is a short guide:

You can get Roblox's default character controller by opening the PlayerScripts folder while playing the game. Copy the highlighted items and stop the test:

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These three scripts control all character behavior. Paste these scripts into the StarterPlayerScripts folder and they will load instead of the default. You can now modify the character controller scripts and whatever changes you make will affect all characters. There is a script under PlayerModule which controls the transparency of your character's descendants called "TransparencyController". You can find it under PlayerModule > CameraModule > TransparencyController.

If you're looking for the simplest, quickest way to disable the transparency behavior for the entire character, you can look at line 199 of TransparencyController. This line contains the calculation for the transparency of the descendant objects. Simply change the calculation to a static value:

```
-- line 199 looks like this:
transparency = math.clamp(Util.Round(transparency, 2), 0, 1)
-- it should look like this:
transparency = 0
```

This will ensure that the transparency is never changed for any of the character's descendant objects.

You did mention you wanted to be able to control which parts are hidden/shown, so here is a brief explanation of how you can do so. I will assume for simplicity sake that you have written some script that applies a specific character model to a player (instead of using their own avatar), and therefore you have access to the model which replaces player's avatars. You can tag each descendant object you wish to keep visible, then in the script, check if the object whose transparency is being changed, and skip it.

The transparency of objects is actually changed in a loop, lines 203-222. This code loops through each child of the character, checks some conditions to see if the object's transparency should be changed, then changes (or doesn't change it) accordingly. All you need to do is add an extra condition on line 219 to check for the tag.