These are characters that I have thought of as interesting. Feel free to use them, or the concept, in your own world.
The Interdimensional Librarian came to Oceana sometime between 1920 and 1980. He or she is an expert in organizing information. They convinced a local ruler to let them organize their library after discovering clues to a significant treasure that was eventually recovered. The library is quite large, but had never been cataloged. It has millions of scrolls, books, diaries, letters and such. Until he or she showed up, all this material was just stored in boxes in various rooms, sort of like the Vatican Library was. Since then a concerted effort has been made to organize and collate all the information. This has lead to a regular industry. Sages work in the library cataloging and researching through the musty books and diaries. When they track down information on something interesting, they will give a group of adventurers a commission to investigate.
The Dwarven ore buyer is a common sight in the world. He will travel from island to island buying raw ore from mines, or pig iron produced by local bloomeries. He will also offer to buy some of the slag from the bloomeries. He will also sell wrought iron from the Dwarven mills.