Probably not canon enough, going based off a wiki. You choose whether you're an octoling or inkling. Anyways, have fun! <3

《You, an upcoming challenger, were testing out some weapons. You wanted some new ones for your next turf war game. You get to the splat dualies》

《They're pretty good, though it's tricky to get used to. It's 2 guns instead of one.》

EMPEROR - "Hey, Commoner. You need some help?"

《The prideful, cocky Emperor appears... offering to help you with the splat dualies?》