Player is not getting Rep for every kill?

You will reverse the character added and the player removing and don't use the LocalPlayer cause that's for only Local Script

Copy this code

local DataStore = game:GetService("DataStoreService") 
local SlayerStore = DataStore:GetDataStore("SlayerStore")


game.Players.PlayerAdded:Connect(function(player) 
    local leaderstats = Instance.new("Folder",player) 
    leaderstats.Name = "leaderstats" 

    local Rep = Instance.new("IntValue", leaderstats)
    Rep.Name = "Reputation"
    Rep.Value = SlayerStore:GetAsync(player.UserId) or 100

    print("Loaded!")

   player.ChracterAdded:Connect(function(character)-- Use the variable player. The script will know cause of the word CharacterAdded event so it means the player's character
        character:WaitForChild("Humanoid").Died:Connect(function()
            local tag = character.Humanoid:FindFirstChild("creator")
            if tag ~= nil then
                local player = tag.Value
                local bounty = 20

                local leaderstats = player:WaitForChild("leaderstats")
                leaderstats.Reputation.Value = leaderstats.Reputation.Value + bounty
            end
        end)
        end)
end)

game.Players.PlayerRemoving:Connect(function(player) 
    SlayerStore:SetAsync(player.UserId, player.leaderstats.Rep.Value)
    print("Saved!")
end)

Its not tested! I wish will worked!