I've had multiple Special Needs birds, though I currently only have two right now. Going from the list above, I'll list my birds. 
 
Leg or Foot: 
My first Special Needs bird in this category was Kai, a Douglas White (an EE mix) cockerel. He hatched with one of his legs stuck forward. I tried putting his legs in a hubble to fix him, but it never worked. He was hatched under a broody, so he stayed with his hatch mates until they were old enough to go with the flock. Then he moved in with two misfits, Nalla (abused by rooster) and Mica (lash egg?). Nalla adopted Kai as if she had raised him his whole life dispite never being broody, and took care of him until his death (at about 3-4 months old). 
My second bird in this category is Lilac. Lilac is an EE hen that I got last year. She has crooked toes. As a chick, her toes were fine and she was best known as "Thief" for her quick maneuvers to "steal" treats from other chicks. As she grew, her toes began to curl, thus putting an end to her thieving antics. I tried saving her toes by wrapping them (as shown by someone else), which failed. She still lives in my flock with her crooked toes. 
Neck: 
I haven't had any known neck problems in my flock yet. 
Wing: 
My first bird with an issue with a wing was Eagle, a rescued Lavender Guinea Fowl. He and his flock was out foraging when a Guinea scream filled the air. Before I knew it, the flock was huring back with Eagle lagging behind. When we figured out the flock, we discovered that Eagle had a broken wing. Both me and my Mom did our best to put his wing back together, but unfortunately, he was never able to fly again. He became best friends with a voiceless rooster named Simon, until Simon's death. Several months later, Eagle passed away with a broken heart of losing his best friend. 
Eagle: 
My second bird in this category was a Sebastopol/Emden mix goose named Jennifer. She somehow broke her wing during the winter. She ended up going to a different home to move to "freezer camp" so she wouldn't suffer with her wing. 
Mobility: 
 
Kai probably is a part of this category. 
Vision: 
As far as I know, I've never had any birds with this as a serious issue. I did have a Black Ameraucana rooster that I suspected eyesight issues, but never had any major proof. 
Beak: 
I've had few crossbeaks. Of my simple crossbeaks, including a hairline, there was Lauren, a debeaked Isa Brown, Beatrix a Whiting True Blue,  a suspected hairline, Lucy a Old English Game bantam, and my first crossbeak, there was Marvalo I, an EE hen. 
Of my major crossbeaks, there is my current one, Amber an EE hen. I got her as a chick and on the way home with her, I discovered that she was crossbeak. Like Marvalo I, I did try to fix her beak, but was unsuccessful. I then turned to trimming and filling her beak, which I still do. She's become one of my more spoiled girls who often gets away with being a little "naughty." 
Amber: 
Crop: 
My crop problems girl was a Speckled Sussex hen named Jewels. I got her for free because she was "too small," though I think the lady was just trying to get rid of her overstock (as I was given a few others too). Jewels appear fine at first, until she matured and I discovered her love of water. I soon discovered that she had a crop problem. After not finding much help to fix her, I settled with putting a crop bra on her for her winter. I took her bra off to give her a break, then it got imacted. I put her on a fast until it went down and put the bra back on her. At some point, I got help from 
@Wyorp Rock, who helped me treat her for Sour Crop. Jewels did well for several months before her crop began bothering her again, which I repeated the treatment that 
@Wyorp Rock had shown me before. After that, she needed the treatment every once in awhile, which was done by me until I rehomed her to a poultry Special Needs home for her retirement. 
Jewels: 
Geriatric: 
And I'm not quite sure what this is. 
So, those are my Special Needs birds, both past and present. 
