Colors not changing in billboard gui?

I assume there's a reason why your script is like this. So, I will just edit some things.

Instead of using Color3.new, use Color3.fromRGB (red, green, blue)

16  function HandleCharacter(Player, Character)
17   local Custom = Character:WaitForChild('Head'):clone()
18   Custom.Name = 'TastiesOverhead'
19   Custom.Parent = Character
20   Custom.face:Destroy()
21   Character.Head.Transparency = 1
22   Create'Weld'{
23    Name = 'CustomWeld';
24    Parent = Custom;
25    Part0 = Character.Head;
26    Part1 = Custom;
27   }
28   Create'BillboardGui'{
29    Name = 'Nametag';
30    Parent = Custom;
31    Size = UDim2.new(5, 0, 0.5, 0);
32    StudsOffset = Vector3.new(0, 2, 0);
33    Create'TextLabel'{
34     Name = 'NameLabel';
35     BackgroundTransparency = 1;
36     Size = UDim2.new(1, 0, 1, 0);
37     Position = UDim2.new(0, 0, -0.8, 0);
38     Font = 'ArialBold';
39     Text = Character.Name;
40     TextColor3 = Color3.fromRGB(0, 255, 0); -- green
41     TextScaled = true;
42     TextStrokeTransparency = 1;
43    };
44    Create'TextLabel'{
45     Name = 'RankLabel';
46     BackgroundTransparency = 1;
47     Size = UDim2.new(1, 0, 0.92, 0);
48     Position = UDim2.new(0, 0, 0.2, 0);
49     TextTransparency = .1;
50     Font = 'SourceSansItalic';
51     FontSize = Enum.FontSize.Size14;
52     Text = Player:GetRoleInGroup(4915753);
53     TextColor3 = Color3.fromRGB(255, 0, 0); -- red
54     TextScaled = true;
55     TextStrokeTransparency = 1;
56    };
57   }
58   

Remember to remove the numbers.

Sorry if this isn't the answer you are looking for. I hope it helps though.

The issue here is stated but I don't have enough info to understand. If the text color is already white (I believe 1, 1, 1 is white) then it won't seem to change.

Also is create a function? It seems to be a bilboard gui. If you want to set a property use object.PropertyName = value. If you want to go down the hierarchy then do a similar thing, Object.ObjectName.

If you are creating something use Instance.new(objectName, parent)

So Mr.Duck, to make a color changing brick or GUI I guess, Here is the code

local TextButton = game.Workspace.TextButton

TextButton.BackgroundColor = BackgroundColor.New = (''Really Red'')

Now just repeat the line on top but change the color in the script!

I hope this helps you Mr.Duck!!!

If there is a problem please comment down below.

If this is not related to your question, please comment to me.