Sabetha would be interested in joining in on his dragon-riding adventures. Might give us a good in to a Questing Sense teaching thread?

In terms of applicable skills, she has darksight and doesn't need to breathe, in case there are any lightless or aquatic spaces to explore. She also has Song of Breath (and Song of Navigation, which might come in handy for finding their way around obstacles), and cantrips to call up light. She's got Extraliminal Gravity and Teleportation II, for use in reaching difficult-to-access areas.

Also if there's an aircraft, she can fly it. I doubt this'll come up, but you never know.