Mental illness besides anxiety and depression
I have loved the good publicity mental health issues have been getting in recent years, but there's still a lot of work to be done. I've enjoyed reading book after book about depression and anxiety, but I think the bookish community (especially YA bookish people) could benefit a lot from seeing more mental illness and how it can affect people - and how people deal with it.
Books that handle it well
Wheelchairs
This is one diverse category that I've only seen once or twice in books and I'd love to see more. I didn't realize how difficult being a wheelchair could be until I became friends with a few people in wheelchairs and realized how difficult just going to see a friend can be if their home isn't accessible enough. I want to see more of this in media in general - and especially in books.
Books that handle it well
Religion
I partly got thinking about this because The Pixie Chronicles mentioned this one, so I am including this to put an emphasis on this. In recent years, religion has become something that people don't really talk about - and especially in books, people often don't view religion as being an important piece of diversity. I personally really think that religion is part of diversity -people all over the world believe in different things and it colors their culture and traditions. I love reading about character for whom religion is important while they also deal with their other conflicts.
Books that handle it well
Polynesian characters
I've been so impressed with all the racial diversity that I've been seeing recently in media (especially books), but we very rarely see polynesian characters in books or movies. While Pacific Islanders are a somewhat smaller group of people, it's still important that they get included in literature, as they have a rich culture that's often overlooked.
Books that handle it well

Have you read any of these books? What kinds of diversity would you like to see more of in books? What books would you add to these lists? How do you help real-life diverse people?