User blog comment:Vulture345/The "Lincoln is Adopted" Debate/@comment-31563773-20170411121342

Ok, I think people are looking into this a bit wrong. If Back in Black is of any point, it's clear Lucy dyes her hair. She actually has blonde hair but dies it black because, well she's an emo/goth. I called BS on the fact she's had black hair since birth because of genetics. None of her parents have jet black hair, and I doubt their relatives do. The reason her baby picture shows her as having such hair is so everyone would know who she is in the picture. For all we know, it could have been one of the twins with Lincoln and Luan in that photo if her hair wasn't dyed. But you can't sit here and tell me she's been a goth since birth. Right now, she's a typical 8 year old who is into that stuff but not well versed as she has trouble with some of her hobbies.

As for Lincoln,  I think his hair was actually supposed to be pale-ash blonde. I saw one picture where it had an older version of himself playing with an 11 year old Lori. However, thinking outside the box, I think his hair is white because he might have just looked like another version of Charlie Brown, so the artists made it white so he'd stand out more. That's one theory, though pale-ash hair looks close to white but has pigment in it, so you could see traces of yellow if you paid attention. Going with that theofy, over time his hair became white due to stress because his sisters drive him up the wall at times. This would be jossed since in The Whole Picture,  he's had this hair since birth.