A Godot 4 C# class for an in-editor gizmo that displays the entity name above them

NameGizmo.cs

/**
 *  A basic gizmo that sets a Label3D child to the name of its parent.
 * Arguably useful for development.
 *
 * The Label3D component will only be shown inside the Editor viewport.
 * At runtime, the object and its hierarchy is removed entirely on call
 * to _Ready().
 *
 * Caveats:
 *  - Super basic, the inverted triangle arrow is a hardcoded unicode
 *    character on a separate line.
 *  - Looking at a downwards angle or rotating the parent makes it look weird.
 *    It is really not intended for runtime.
 *  - It does not update if you rename the parent after instantiating it in
 *    the editor. Reloading the scene or project does, however.
 */

using Godot;
using System;

[Tool]
public partial class NameGizmo : Marker3D
{
    private Node3D _parent;
    public static Label3D _label;

    public override void _Ready()
    {
        // Delete ourselves if we're not in the editor
        // The entire node can just be removed at runtime.
        if (!Engine.IsEditorHint())
        {
            QueueFree();
            return;
        }

        try
        {
            _parent = GetParent<Node3D>();
            _label = GetNode<Label3D>("Label3D");
            _label.Text = _parent.Name + "\n▼";
        }
        catch (Exception) when (ex is InvalidCastException ||
                                ex is TypeAccessException)
        {
            GD.PrintErr("NameGizmo: Not parented to a Node3D, not updating.");
        }
    }
}