It can be any Princess . . . the sign at the end of the cue will tell you who, and then there is a ? for the mystery Princess.
We’ve met, Belle, Cinderella, Snow White, Aurora. We even met Ariel there once, but that was before she had her own Grotto.
You don’t have to book a meal to meet your favs. But it is a good way, instead of standing in line you EAT while you wait! :happy: