Igneel

Igneel is a dragon and the foster father of Natsu Dragneel. He taught Natsu how to write, speak, and even how to use the fire-brand style of magic known as "Dragon Slayer". For some still unknown reason, Igneel disappeared one day without saying a word to Natsu on the 7th July 777 (along with the other dragons Grandine and Metalicana), leaving Natsu to fend for himself. Natsu dreams of meeting Igneel again, and searches for clues of his whereabouts throughout the series.

Personality
Igneel has been shown to be a loving parental figure towards Natsu, however, leaving him to fend for himself leads one to doubt this. Despite leaving him, Igneel is shown to be incredibly protective of Natsu as he watches him from afar.

Contrary to his loving self, Igneel can also be very fierce when he wants to be.

According to Grandine, like Natsu, Igneel has a tendency to take things to excess.

Tower of Heaven arc or Fighting Festival arc (anime only)
After the events at the Tower of Heaven, Igneel is shown residing in a volcanic region, talking to the dragon who raised Wendy Marvell, Grandine, about Natsu. Igneel immediately orders Grandine to leave once it sounds like she threatens Natsu/states that he'll get killed eventually. He then makes a reference to the Black Wizard Zeref and the dragons' removal from human affairs. He then shows that he is in fact very firm on leaving humans alone, especially Natsu. Hearing these words, Grandine leaves hoping that Natsu's friendship with Wendy will be better than his "friendship" with Metalicana's foster son Gajeel Redfox.

Magic and Abilities
As a father and a mentor of Natsu Dragneel, Igneel also uses a fire magic, but probably more powerful then his "child".

Fire Dragon Magic: It includes creating and manipulation of fire. In maga was shown that Igneel can create a fire over all his body.

Trivia

 * Igneel seems to have a scar on his neck. Coincidently, Natsu also has a scar on his neck, it is unknown how the both of them got these scars though.
 * According to the earlier chapters of the series; Igneel taught Natsu letters, further explained in the anime, after only teaching him letters, Natsu had problems with reading things that had nothing to do with food.
 * He made an appearance on 4th opening.