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A cold, distant person, Sasuke likes to win and succeed. When Sasuke was young his clan was murdered by his own older brother, Itachi. With his parents and family now gone his brother spared him and left him to survive by himself. Sasuke tried to forget about the past by applying himself in the ninja academy and fitting in with the rest of the leaf village.

After his fight with Naruto he believes he's been wasting his time 'playing ninja' with the people of the leaf village. His new goal is to get stronger so he can revenge his clan by killing Itachi and then to restore the Uchiha clan.

As a wielder of the Sharingan(the kekkei genkai of the Uchiha clan), he learns to use Chidori and has a vast knowledge of the various Fire Jutsus. The curse seal which Orichimaru gives him during the Chuunin exam, at first, enhanced his power but at the risk of killing him. Now he can use it of his own free will.

Claiming at first that he doesn't need any friends, he is forced to contradict himself when he sees that either Naruto or Sakura are in danger. Remembering this type of Sasuke is what brings motivation to Naruto and Sakura. He openly admitted to Naruto being his closest friend.

Sasuke has black hair with a blue tint that lengthens as the story goes with onyx eyes and has lighter skin than his brother Itachi. Like many other members of his clan, his hair hangs over both sides of his face to roughly his cheeks. In his curse seal form, he has grey skin with wings on his back that resemble giant webbed hands. He also has hair similar to Madara Uchiha except in a greyish-blue color.

At the beginning of Part I, Sasuke's clothing made up a blue, short-sleeved shirt with a raised collar and the Uchiha crest on the back and white shorts. An interesting thing is that during Part I the Uchiha symbol on his back gets smaller each time he changes his outfit. In the last stage of the Chunin exams, he wore a black, one pieced version of this outfit but eventually went back to his original clothes.

In Part II, Sasuke has grown noticeably taller (almost eye height with Itachi) and slightly more muscular. wears a white long sleeved shirt that's open at the torso with a smaller version of the Uchiha crest on his collar. He wears black pants with a blue cloth hanging from his half way up his stomach to his knees. He also wears a purple rope belt (Japanese name: Shimenawa) tied in a bow fashion found on many Sound ninja, only the bow is in a different style and is tied in the front instead of the back. He also will at points remove his shirt and hang it from his belt around his waist to give his wings in Curse Seal Level 2 room to move (also without transforming). Sasuke, even though claiming to be emotionless, wont kill when uneeded.

Jutsu:

Earth Grudge Fear:

This technique is a secret kinjutsu of Takigakure. It transforms the user's body into something similar to that of a rag-doll's, which is held together by hundreds of thick black threads. Kakuzu was able to manipulate these threads for many purposes. He was capable of sewing up any injuries that he or others might suffer, most commonly by reattaching body parts. 
He could detach parts of his limbs and then manipulate them, to the point that he could even send them underground and then reattach them when he was done with them.
The most significant aspect of these threads were that they granted Kakuzu a form of immortality, although he declined to think of it that way. In addition to sewing up his injuries, he could use the threads to tear into a victim's body, steal their still functioning organs, and integrate them into his own body, thus extending his life.


Fire Release: Intelligent Hard Work:

Kakuzu's fire-element mask spits out a small fireball that erupts into a giant firestorm after making contact with a surface, causing widespread destruction to the area. Since the flames travel along the ground, and cover such a wide area this is a difficult technique to evade. The effect of this technique can be increased greatly by combining it with a Wind Release technique like Wind Release: Pressure Damage, which is strong enough to evaporate water.


Lightning Release: False Darkness:

Kakuzu's lightning-element mask emits lightning in the shape of a spear from its mouth, which then pierces the enemy. Its destructive power is great enough to even pierce through rock; meaning it has a high killing potential. The user can increase the number of spears to attack multiple enemies. This makes it nearly impossible to evade.

Wind Release: Pressure Damage:

A powerful wind technique which is released by Kakuzu's wind-element mask. A tornado-like mass is compressed until it has a very high density and is then released. The wind pressure is raised to its highest limit, and once the technique hits the target, the resulting blast sweeps everyone off their feet.
If the technique is used by someone who has mastered wind nature transformation, the blast can hit a vast range, inflicting massive damage on both the target and their surroundings.

This technique can be combined with the Fire Release: Intelligent Hard Work, to increase the flame's potency in a great scale, causing a massive firestorm.


Other:

Kakuzu can harden his skin, proving many physical attacks ineffective.