I am not sure if I was the only one who noticed this but during the Simon reveal trailer you can see that the Poltergust luigi is wearing looks completely different and nothing like the Poltergusts we have seen in Luigis Mansion 1 and Dark Moon. It looks less like a vacuum cleaner and more like an actual containment unit that you would see in something like Ghostbusters. Note the large green tank that takes up much of the device on Luigi’s back. I wonder if they could be hinting at something here
“Do you know how the gossip mongers refer to you? They are out there at this moment whispering amongst themselves… that you are the heir to a throne of nothing… nothing but failure. It is woven into your destiny that you prove them wrong.”
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Only Seven Acres of Rose of Pollux's Musings & Daydreams 