Aura frowned, streams of liquid helium running off of her, chilling the air. "At least I'm not making everyone squeaky anymore. Though I think the door to this compartment is frozen shut by now." she muttered to Aria. But she forced a smile onto her face and bowed to the man. "I'm Aura. My element is Helium." Then she turned to Dan. "Okay, Dan, here's how you tell us apart. Aria's the really puny one. I'm just sort-of short. You can remember that the bigger sister corresponds to the bigger element."
"I am not puny. I just haven't hit my growth spurt yet." Aria complained.
"Well, until then, face it sis. You're teensy. There are third-graders taller than you." Aura went to punch her sister, again saw the helium beading up, threatening to freeze whatever she touched. She carefully folded her hands in her lap again. "Guys, can we at some point figure out how to make me quit leaking so much supercooled liquid? I'm going to freeze us all at this rate."
"Got you covered, sis." Aria muttered, biting her lip as she formed a sphere of hydrogen just above her hands and snapped her fingers to throw off a spark, making a big globe of fire hanging in the air and vaporizing the liquid that Aura was throwing off. She grinned, ecstatic that it had worked. "I'm Aria, my element is Hydrogen." She said to the man. "and in case you missed it, I can light things on fire. If I need to. Also when I get scared I don't always have the greatest control over it, fair warning."