The group has announced their official color to be a color of a complimenting name "fearless blue." According to the statement that was released along with the official color, "'Fearless blue' is the same color as the highest temperature of a star. It has both aloof yet passionate characteristics of LE SSERAFIM and FEARNOT."
I really love the effort companies put into choosing fandom colours for their artists. Like the fact they went to find a colour that specifically means to be fearless and confident and all that for their concept. So cool. It's such a pretty colour too, and has that Le Sserafim feel to it