"Because when we just debuted in a concert with other groups, we saw there were some sapphire blue colors, between all the other colors of all the other fandoms. Day by day, the sapphire blue color kept growing, getting bigger and bigger. We realized that the sapphire blue color is the source of our spirit, happiness and our strength. As we know from the legend, ELF is a beautiful creature like a fairy. They’re beautiful and always give happiness like they spell it. Because I realized those creatures that we see now, that always make a sapphire blue ocean that is the most beautiful thing, are like ELF in the legend. They’re also beautiful, always giving happiness to us, always protecting us. So I named them, ELF. Now those creatures are so many and make big sapphire blue oceans which is so beautiful, the most beautiful thing. Even though we don’t know all of them, but we know they’re always there where ever we go, and I love them all. Those creatures are E.L.F, our everlasting friends."
-Park Jungsoo (The reason how the ‘ELF’ was created)
If Kyuhyun is interviewed, he always says that he usually spends his time by reading, then other members will disagree it.
Leeteuk was borm when it was raining which is why he loves it when it rains.
Siwon enjoys it when the other members use his beauty products. He even buys bigger containers because he knows that the other members are using them.