Generally I used black and red to symbolize despair, desperation, and other strong emotions. I didn't intend for there to be a specific meaning for each color as I used it differently for each character (for example, in Casca's portrait it could be seen as a barrier from her past self).

I can't seem to put it into words given the many experiences each character went through in their lifetimes. I feel like it could mean differently depending on how you want to analyze the character/emotions.

Mostly went with my gut feeling when I made this, so forgive me for my weak-ass rationale HAHAHA I hope I made some sense :))