Jumanji rules here. The players are themselves, just wearing the skin of the characters. The “blurbs” up top are basically meant to be your “intro” to a character you might see on a board game manual or such.
And I wouldn’t call Galeth the “protagonist” either. All the characters are protags in their own right. The core 4 are just playing out the stereotypes of an old school RPG
So, just to confirm, they assume the physical appearance and the skills of the character they are playing, but not really the memories? They'd basically know only the character background/info about the character that they read for their role, yeah?