“Its body is composed of plasma. It is known to infiltrate electronic devices and wreak havoc.”

Luigi’s poke would be a mischievous Rotom that would constantly scare him for fun. Although he doesn’t mean him any harm, he just finds Luigi funny when he gets scared. If anyone else scared him or tried to hurt him, he’d go off to the rescue to help.

I imagine this Rotom being super attached to Luigi like he’s a best friend, but shows his affection by spooking him and pulling pranks. If Luigi ever got super mad or yelled at him, I can imagine the little electric dude being really hurt.