oh, i almost forgot
theres new amiibo functionality in splatoon 2, which you can see in the video i linked above
in this case, you can befriend the amiibo character and they will remember your favorite weapons/clothes/whatever and you can swap your outfit with the amiibo's outfit (which comes in handy when you go over to a friend's house to turf war) and you can also take pictures with your amiibo and share them online so thats a thing
the 3 new amiibos:
the old splatoon 1 amiibo also work fine