When it comes to the ultra-shy folks, I'm not sure if anything more can be done other than finding them a buddy to help shove them into RP (I like to think of it as an RP wingman/wingwoman :V) or just being as patient and welcoming as possible. That's a case where they really just need a good friend to act as the mentor/handholding figure for them to help them get over their anxieties, but at the same time -- no one is really obligated to take on that role for someone either, so it's a tough situation. They need a buddy who doesn't mind being that figure for them until they're more confident.
Also, when it comes to those wikis - they don't really do much all on their own after you create them. I personally only look through wikis after someone's done something or written something that caught my eye and made me more curious (or if they look really cool :V). It helps to find a way to sort of subtly attach it to your RP, so sticking it in your search info definitely can help because if you do an RP action that catches someone's interest, they can peek at your search info and then get more insight into your character.
I think this is why some folks have had success posting up writing on the forums as well -- people read their stories, get interested, and then poke at the wiki.
Also, when it comes to those wikis - they don't really do much all on their own after you create them. I personally only look through wikis after someone's done something or written something that caught my eye and made me more curious (or if they look really cool :V). It helps to find a way to sort of subtly attach it to your RP, so sticking it in your search info definitely can help because if you do an RP action that catches someone's interest, they can peek at your search info and then get more insight into your character.
I think this is why some folks have had success posting up writing on the forums as well -- people read their stories, get interested, and then poke at the wiki.