Natsu's main outfit consists of a sleeveless, gold trimmed, black waistcoat, often left open and untucked, exposing his bare chest, a gold trimmed, black cloth around his waist that reaches his knees, held by a leather brown belt with an oval-shaped silver buckle, white knee-length trousers with black ribbon ties, a thick black wristband on his left wrist, black open-toed sandals and the scale-patterned scarf he received from his adoptive father, Igneel. He has also been known to wear a rolled up comforter strapped across his back, though he rarely carries it in battle.
In the year X791, Natsu's attire receives minor changes. He now wears an open-collared, one-sleeved long overcoat version of his original waistcoat, which is instead tucked in and zipped. The sleeve covers Natsu's left arm with a faux leather brown armband, leaving his Fairy Tail mark, as well as his entire right arm, consequently exposed. Natsu continues wearing Igneel's scarf and retains the same lower clothing. He now wears his wristband on his right wrist.
After his clothes were taken during his capture by Tartaros and later release, he now wears a new set of clothing: a black long-sleeved jacket, often left open, untucked, and no undershirt (much like his original waistcoat) with light-colored trimming and the sleeves rolled up to his wrists, black baggy pants held by a leather brown belt with a silver buckle around his waist, and a pair of dark brown, high-calf boots; there are several yellow, skull-like patterns on the jacket and pants.
In the year X792, Natsu is seen wearing a large, tattered, dark cloak with his trademark scarf. His pants are torn and patched and his arms and legs are wrapped in bandages. Later, he discards this outfit in favor of his old one, although he keeps the bandages on his right arm, which hide a draconian tattoo holding a portion of Igneel's power. Following the one-time use of Igneel's power, the tattoo disappears and Natsu abandons the bandages.
Natsu is carefree and reckless in nature, and, despite his consistent brawls with the other members of Fairy Tail, he is a fiercely loyal and protective friend. He is willing to go down fighting for his friends, regardless of how futile it might seem. Natsu has a straightforward mind, and often tackles issues with a "hands on" approach. His solution to problems often involve violence. Even when disrespected or faced with obvious hostility, Natsu rarely ever reciprocates the feelings, and often forgoes grudge-holding. He did, however, for a short time, hold a grudge against Jellal Fernandes, but eventually forgave him and considered him an ally. He occasionally shows compassion for his enemies, such as when Cobra was betrayed by Brain. Natsu rarely exhibits any perverse tendencies towards the opposite sex, there only being two noted instances. The first is seen prior to the Grand Magic Games, when he is seen trying to peek, along with several other of his male Guild mates, on the women as they bathed. The second is when Lucy comes crashing into him while nude, and he stares at her body, even groping her breasts for a moment.
Natsu continuously tries to prove his strength to others. At various points in time, he has challenged Erza, Laxus, Mirajane, and even Gildarts (in short, all of Fairy Tail's current S-Class Mages), to fight him, albeit, he was beaten every single time. Despite his losses, Natsu bears them no ill will, as he considers everyone in the guild to be his family. He demonstrates this attitude even towards former enemies. Natsu has even gone as far as defending Laxus from being expelled, despite his attempt at taking over the guild. Due to his reckless nature, Natsu's fights usually ends with widespread destruction. Natsu's love of fighting has allowed him to develop a rather strategic mind, helping him to, on various occasions, find weaknesses in his opponent's techniques, or simply weaknesses his opponents themselves possess. Natsu has also defeated his opponents with pure wit, rather than brute strength. Natsu, befitting his recklessness and love of fighting, never backs out of a fight.
Natsu was very close to Lisanna, and, because of this, after her supposed death, no one in Fairy Tail mentioned her out of respect for his feelings. However, after Lisanna's return to Earth Land from Edolas, this is no longer the case.
As a Dragon Slayer, Natsu suffers from motion sickness. Natsu becomes sick from riding on any form of transportation, even if the transportation happens to be other people, as shown when he was carried by Lucy. This, however, does not apply to Happy, as he considers him family, not transportation. Natsu can become sick from looking at, or simply thinking about, any form of transportation. In spite of his naturally dense nature, Natsu is quite perceptive and understanding of his friend's feelings. After his battle with Gildarts during the S-Class Mage Promotion Trial, Natsu came to understand and accept fear, and has used this acceptance to help his guildmates and himself emotionally grow. Prior to this event, Erza’s wrath (albeit for comic relief), transportation, and the Magic Council were the only things that Natsu feared.