game.Players.PlayerAdded:connect(function(plr) repeat wait() until plr.Character ~= nil local char=plr.Character local hum=char.Humanoid hum.WalkSpeed=35 end)
You can use the CharacterAdded event to make some code run every time something spawns.
This code is straight from the roblox wiki:
game.Players.PlayerAdded:connect(function(player) player.CharacterAdded:connect(function(character) character.Humanoid.WalkSpeed = 35 end) end)