Ideas for d&d characters:
A thief disguised as a wizard, because they know no one wants to fuck with wizards.Big ol’ quarter staff, robe, pointy hat, the whole nine yards. They would have tons of tricks and traps, smoke bombs, flasks of oil, ect to make them appear to be a wizard. They would know no spells. When asked by the party, it’s all ‘oh I didn’t learn that one’ or 'I don’t have that memorized today’. They will have an explicit preference for magical items and skills in identifying them, because hey, do you know how much those are worth?? They’re a thief after all.
Maintain the ruse as long as humanly possible.