Sweetie Cakes

Their names are, respectively, Sprinkle Stripe (was meant to be strike, but the doctors messed up and they all rolled with it) and Sweetie Blue. 

Sprinkle Stripe:

Blind, and their eyes are somewhat scary looking, so they grow their hair out to cover their eyes. Of course, they can't see it themself, but reactions from Blue tick them off, as well as other people's comments. 

Stripe also is very mute, and prefers to speak through Blue, or use magic/writing/sign language to communicate. They may even be deaf as well, but it's hard to determine.

They have the only useable horn, but still stunted in growth, so they can't preform anything much more complex than simple levitation. Their front right leg is small and weak, so they usually use magic to perform tasks.

Sweetie Blue:

Sweetie Blue has very poor eyesight, but can see. Her pupils are usually very dilated, so shes usually squinting. She needs special glasses to see, but hey end up getting cracked more often then they'd like. It takes a long time for her family to be able to replace them.

Sweetie Blue is the communication outlet, both for reviving and giving information. Sweetie and Sprinkles minds are very connected, but can operate independently. 

Her horn is incredibly stunted, and cannot perform any magic whatsoever. 

As a Duo:

Sweetie Blue and Sprinkle Stripe get along well enough, and work together to get tasks done. Hair styling is mainly done by Blue, with a bit of input of length from Stripe for theirs. This is how many tasks go, except for things like writing, which Stripe does mainly on their own, with input from Blue when needed. Blue actually can't write very well on her own due to this.

Sweetie has one, very small, basically useless wing, while Stripe basically only has a small clump of feathers.