"Emissary" refers to a person who is sent by someone or an organization to deliver a message, represent them, or carry out a task on their behalf. Full definition
The Paratroopas reappear in the Subspace Emissary of Super Smash Bros.. (mariowiki.com)
I found Smash Run to be a fun diversion every now and then, but it won't satisfy players who were hoping for a true side - scrolling adventure mode in the vein of Subspace Emissary from Super Smash Bros.. (tomsguide.com)
Unfortunately there is an absence of the single player story mission known as Subspace Emissary from Brawl. (gamerassaultweekly.com)