One of the more fascinating hair trends of the last few years is dyeing the underlying layer of your hair. It creates a sort of mask-like effect that allows for a big reveal on your terms. Depending on how you style it, this look can also have a bit of a highlight effect, brightening and drawing attention to your face.
Texas (from Arknights) definitely looks like someone you don't want to mess with her bright red underlayers.
Have any of the illustrations below given you a color palette or two to think about for your next 'do?