How do i copy players in workspace?

What Dev answered is almost correct, however it won't work since the character itself isn't archivable. Theres also a lot of unneccesary code, and ideally it can look as short as this:

for _, chars in pairs(workspace:GetChildren()) do
    if chars:FindFirstChild("Humanoid") and chars ~= plr.Character  then
        chars.Archivable = true
        local copy = chars:Clone()
        copy.Parent = workspace
        game.Debris:AddItem(copy, 10)
    end
end

• All you have to do is check if theres an instance with a humanoid, and it isn't the plr's char
• You have to make their character archivable before you copy it, otherwise you get an error
• The copy will already have the same position as the instance it copies

for _, model in pairs(workspace:GetChildren()) do
    if model:IsA("Model") then
        for _, part in pairs(model:GetChildren()) do
            if part:IsA("Humanoid") and not plr.Character.Humanoid then 
                local copy = part.Parent:Clone()

                copy.Archivable = true -- Archivable is turned off for all Player's Characters, you have to Enable it if you want to make a copy of a Character

                copy.Parent = workspace
                copy.HumanoidRootPart.CFrame = part.Parent.HumanoidRootPart.CFrame
                game.Debris:AddItem(copy, 10)

            end
        end

    end
end

hope this helps