Alola, Alola! It's time for the finale of SM!
Moon has a sister! Gee, I wonder who it could be. /s
And now it's Sword and Shield time!
Well this is odd. Our new protagonists aren't named Sword and Shield after all. Well, sort of...
The boy is 剣創人 or Soudo Tsurugi. (Tsurugi means "sword". Soudo is phonetically the same as "sword" in Japanese.) He's nicknamed "So-chan".
The girl is 盾・シルドミリア or Tate Shirudomiria. (Tate means "shield". Shirudomiria contains "shield".) I have no idea how to romanize that. Is it even a real name? She's nicknamed "Shi-chan".
I'm not sure if the Grookey is Soudo's, but Tate has Scorbunny.
The kid is Manabu. That name sounds familiar, but I'm not sure if it's significant. Probably just an in-game NPC. He's nicknamed "Ma-chan".