There's this random stabby spike on the top of it and it makes no sense to be part of a washing machine.
Edit: The rest of the Rotom have it too, so what is the spike?
It's not random; That spike carries from form to form : look at the sprites.
And now the forms:
Oddly, Mow doesn't have a spike, but all the rest as you can see do from the original form.
I think it's supposed to represent a lightning rod.
"Rotom has a body of plasma and shaped like a lightning rod."
Hope I helped :)
All rotom forms have it. Rotoms forms all have a resemblence, the crazy eyes and smirk, and that spike, so its most likely why Rotom Wash has it, to look like a rotom!
Hope I helped!