Nathan and Natalie are both jack of all trades adventurers; super strong and trained in combat (fighter), agile, perceptive, and good at spotting and disarming traps (thief), innately magical masters of arcane power (sorcerer/sorceress, though they prefer the term "wizard"/"wizardess" and chalk up lack of books to having better memory than their fellow scholars), and devoutly religious with occasionally having miracles worked through them by the Deity they worship (Cleric/Paladin). They're like...12th level D&D characters disguised as 1 HP vermin.
Natalie likes looking the part of a traditional cleric/healer while Nathan prefers looking more like a knight (sometimes with a wizard hat, but not here).