User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 27: March 2014/@comment-7740542-20140402225135

dont know if anyone's answered mega's riddles yet but the answers are:

lucy is 17 when introduced,

ichiya's hair is orange,

natsu, gajeel, wendy, cobra, sting, rogue, laxus, and acnologia used to be one before turning into a dragon. so 7 or 8 depending on your whether you include acnologia

future lucy said 10,000 dragons would invade fiore