When making the attempt to pick locks, you *do* need to select the right character. But the lockpicks can be on anyone. Same for identifying stuff, digging, or opening doors using keys - the Identifying Glass, shovel, and keys can be on anyone. The game automatically uses the relevant item from whoever is having it. In the case of identifying items and examining NPC's, the game does select the best member for the task; you don't have to.
Last edited by Try2Handing; 10/09/18 10:47 AM.