Alright, now the ending of this makes a little more sense. Shohei initially takes the role of the <player> in Sun and Moon because he comes from Kanto to Alola, but in the end when he goes back to Kanto he takes the role of Lillie.
Also, although this could be noticed earlier, Hoku is obviously Hau due to choosing the starter weak to the player and using a Raichu, and the blonde "bad" kid, who uses Silvally, is Gladion.

For who hasn't watched these yet, they're amazing:

https://www.youtube.com/watch?v=pKieqhDHDq4
https://www.youtube.com/watch?v=TFqxPWVIU2U
https://www.youtube.com/watch?v=JZcqvFtWyqI