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Natsu has a carefree and reckless nature and constantly bickers with other members of the guild. He has a competitive relationship with frequent teammates Gray Fullbuster and Erza Scarlet; Gray tends to insult Natsu, prompting frequent skirmishes, while Erza, an S-class wizard, represents a way for Natsu to prove how strong he is. Despite his reckless and headstrong nature, Natsu is a skilled tactician and can pick up on an opponent's abilities and weaknesses very quickly. He is also vehemently loyal to Fairy Tail, and does not allow anyone to sully its name.

Source from Wikipeida