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Gajeel Redfox, similar to Natsu, is a Dragon Slayer raised by the dragon Metalicana. He specializes in Iron Dragon Slayer magic, which allows him to transform parts of his body into metal weapons such as clubs and swords, cover his body with nearly indestructible metal scales, and breathe gusts of wind containing metal shards capable of shredding a person's body. He can also consume metal objects for nourishment. He is introduced as an S-Class wizard from Phantom Lord, and is responsible for destroying the original Fairy Tail guildhall. After Phantom Lord is disbanded, Gajeel is encouraged by Makarov to join Fairy Tail in an effort to guide him rather than out of forgiveness. 

Source from Wikipeida