Offcomer

Similarly, there is jokey talk of the possibility of dynamiting offcomer homes in the village (just as the Welsh have done to English cottagers), and of beating up any offcomer who tells tales about Wanet to other offcomers […]

They are offcomers, a neat appellation intended to highlight their lack of local family. This could be reinforced with suitable word associations; 'from down South' was typical, or something implying weirdness such as 'he is into art'.