>>51330845>1 : a resident who was born elsewhere and is not a citizen of the country in which he or she now lives. 2 : a being that comes from somewhere other than the planet earth. alien. adjective. \ ˈā-lē-ən, ˈāl-yən \Even if their DNA is compatible with humans from poke-earth, they are by definition aliens.
Now taking it to the next level, that if these are not alvins, if not that they genuinely have blue blood due to their Haemocyanin levels like lobsters and other marine animals. That would fit very well with the ultra sea and that their names are based on algae.
Well leaving the headcanon aside, I love that the little lore they gave these blue people is that they basically have xenomorphs as starters. I hope that one day they return to the theme of the ultrabeasts and their worlds at least as cameos.