Whatsit and company from A Wrinkle in Time, maybe? Although not so much. Huh. Women tend to be more, like, Oracles of Destiny instead of mentors. Like, she'll tell you it is your destiny to go win the war, but he'll travel part of the way with you until he gets killed off to Lose the Battle, Win the War and also facilitate your growth as a character.

What the hell is up with that? Also, they meet like 100% boys on the trip, and Lucy doesn't even get a lady's maid, which seems silly 'cause who's chaperoning her? Anyone on that boat could pull a baby out of nowhere and insist it's hers and therefore the rightful ruler (either in Caspian's stead or after he's gone).