How To Change Characters Name Through Script?

Neither work

Simple, just do .Name like so

script.Parent.MouseButton1Click:Connecr(function()
    Whatever.the.character.is.Name = NewName -- this could be localplayer, but u need to reference it from the local side if it is
end)

Change the function from a click to whatever u want, idk if this works but try it

local character = workspace:FindFirstChild("CharacterName") -- INSERT CHARACTER NAME HERE

local text = {"INSERT TEXT HERE"}
local WAIT_TILL_DEFAULT_NAME = {2} -- How long you want to wait after the text has been completed for it to return to the character's original name
local ORIGINAL_CHARACTER_NAME = {"John Doe"} -- What was your characters original name, the reason being ^

-- Insert whatever function you want that will trigger this, be sure to add a end) at the end of the script-paragraph depending if it's a loop or a function
-- I will add a while loop to satisfy my OCD
while true do
    for i = 1, #text do
        character.Name = string.sub(text, 1, i)
        wait(0.04)
    end
    wait(WAIT_TILL_DEFAULT_NAME[1])
    character.Name = ORIGINAL_CHARACTER_NAME[1]
end

First of all create a normal script, then insert the following

game.Players.PlayerAdded:Connect(function(player) -- Does something when a player joins.

    player.Name = "Insert the name :D" -- Player.Name is basically the name of the player!
end)

I know this has got nothing with your answer to do but you can also change other things of the player, Forinstance

game.Players.PlayerAdded:Connect(function(player)

    print(player.AccountAge)

    if player.AccountAge == 2006 then
        print("You are a roblox veteran")
    end
end)

And other cool things.

If there are any errors please re-comment