Here’s a Scary headcanon.

Scary’s a natural blonde, she dyed it black to be more goth, so at the beginning she had it dyed, but as the adventures kept lasting longer and longer, she hasn’t had time to dye it.

All this to say, in the latest episodes, where she’s been more open and supportive, her hair is almost back to her natural color, making her look more like when she went by Terri/Terry (however it’s spelled)