In highly staffed libraries, it can be great for teens (who tend to be a bit standoffish when it comes to librarians) or for introverted patrons who love the library but would much rather be left alone. In smaller libraries, it's a fantastic way to create unique experiences at each library visit without having to overextend a small payroll.
This is a great opportunity to introduce kids to new faces from history, and maybe even give your nonfiction/biography section a little use.
Post a picture of your figure with their name, and invite people to write their name, number, and a brief sentence saying who that person was and what impact they made, and draw one person as a winner. It could be as simple or complex as you'd like.
Here are a few figures you could use: