I'm feeling what you have already with The Seeker and bet you could do a lot with the Indy J inspiration:
- Special ability like, "BELONGS IN A MUSEUM - break or abandon a valuable found object to gain x..."
- Special items: Whip, Fine Pistol, Lucky Fedora...
- Choose a name traditionally given to a dog. Describe your relationship to the dog.
- Friend/Foe: At least two or three labeled as love interests. Father.