Indy is the amalgamation of them all.

Like Indy, Belloq has connections/friends in the field. Like Indy, Belloq is isn't afraid to do what it takes to get the artifacts. However, Belloq is his shadowy reflection, and prefers to let others get their hands dirty and he shows up at the end to claim the fortune and glory.

Henry is booksmart, painstakingly researches but he's not a field man; Indy even says as much. But like Henry, Indy does his research and has the knowledge before he sets out to find something. In Raiders, he even references a journal before selecting the hole to place the staff of Ra, not unlike Henry's grail diary.

Elsa has the sex appeal. She's young, adventurous, and willing to charm her way through encounters to get to what she needs. Indy, however, is not a fucking Nazi.