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Personality
Renji has long crimson hair, usually kept in a high ponytail, and his entire upper body is covered in tribal tattoo work. As far as his personality goes, Renji is about as eccentric as any other Soul Reaper. He varies from smug and cocky in his first appearances to downright angry and depressed after his major defeats, but shows himself to be an incredibly serious and determined fighter when confronted with an actual challenge. Willing to fight, kill, and die for whatever he believes in, Renji is a dangerous man to those who stand in his way. He is similar to Ichigo Kurosaki in many aspects, and the two are mistaken for brothers in the anime's Bount arc. Ichigo claims they are cousins to keep things simple, allowing many hilarious situations to occur later, including comments over their unusually colored hair. A continuing gag in the series is Renji's nick name, red pineapple, referring to his crimson hair kept in a pineapple top-like ponytail. During a filler arc before the invasion of Las Noches, Renji wears a shirt with 'Red Pineapple' printed on the front, supposedly bought by Ichigo Kurosaki as a joke. He's even referred as "Aka Pine" during the Shinigami Cup segments.
Master Swordsmanship Specialist: Renji is highly skilled in swordsmanship techniques, having trained under Ikkaku Madarame. He has increased his strength and skill to allow him to become a captain-level fighter, so as to achieve his dream. A clear example of Renji's prowess was shown from his ability to hold his own against and even make a warrior of Byakuya's caliber fight relatively seriously. What makes Renji so effective is the unique method in which his zanpakutō works, in the fact that his zanpakutō is more of an amalgam of a whip and a sword. Renji is versatile because of this, and to effectively wield it is a testament to his skill. When asked by Hinamori if he defended Renji in a decision about his possible demotion, Aizen stated that he was not the only one, as "everyone likes him and he has talent."[6] It is worthy to note that he is also the only shinigami (besides Kenpachi), and, along with Rukia, non-captain so far to injure an Espada using only his shikai.[7] This was a feat even Tōshirō Hitsugaya, a captain, could not perform.[8]
Flash Steps Expert: Knowing that Zabimaru's shikai attacks leave him open for counterattacks, Renji has become highly proficient at Flash Steps to compensate for it. Renji can even keep up with captain-level Shinigami for an indeterminate amount of time. He knows enough to be informed on their higher level techniques, though whether or not he can effectively use them is debatable.
Kidō Practitioner: He can also use kidō like most Shinigami. While in the academy his skill for it was rather poor, as he stated they would constantly blow up in his face, he has become proficient enough to perform a Level 33 Kidō without incantation, not to mention with explosive power. His Kidō spell was powerful enough to injure an Espada, albeit hurting himself in the process.
Enhanced Strength: Like most upper-tier Shinigami, Renji has great strength. When he swung Zabimaru toward Ichigo in their second fight he was able to easily toss him into the air, and subsequently push him through an entire building about a dozen meters away, with relative ease. During the fight with Szayel Aporro's unique Fracción, Renji protected Uryū from a direct punch by one of the stronger (and larger) arrancar using both hands, and proceeded to throw him aside. Later, by spinning Zabimaru above his head, Renji was able to cause enough force to generate a whirlwind, blowing away all of Szayel's Fracción several yards despite their massive size.[9] Szayel commented that he was using "brute force."
Enhanced Durability: Renji has been shown to have an incredibly high endurance, at least on par with Ichigo Kurosaki. In their first real fight, Ichigo defeated Renji by using a full power (although he did not say its name) Getsuga Tensho directly in shikai, and was still able to walk over, pick up Ichigo by the collar and remain conscious until his request was made. Later during his fight with Byakuya, he is hit directly by every blade from Senbonzakura Kageyoshi, and when he continues to fight he is pierced by five more blades. Even after such terrible damage he makes a last ditch effort attack, almost piercing Byakuya with Zabimaru, and finally falls defeated. Just one day later he is able to function enough to use shunpo, carry Rukia Kuchiki while running down Sōkyoku Hill, and even duel Aizen using his Shikai.
Determination: Renji has a ridiculously high determination, which also has a direct correlation with his endurance. Aside from the events during the Soul Society arc (see Durability), Renji shows his will to fight when after finding out Rukia had been supposedly killed, he is finally able to injure the 8th Espada using sheer reiatsu through his blade.
High Spiritual Energy: Being a lieutenant of the Gotei 13, Renji already had a high spiritual energy. Upon learning Bankai, this power increased on a scale from 5-10. Rukia even comments after feeling his defeat that it was so high, she could not recognize it until it decreased which caused it to become more familiar to her. Szayel Aporro Granz was greatly excited to meet a shinigami who could use bankai, as one would need a high amount of power to achieve it, making him a rare specimen. Using his reiatsu in shikai, he was able to injure that same Espada by transferring it through Zabimaru.
Zanpakutō
Zabimaru (蛇尾丸, Snake Tail): Renji's zanpakutō is one of the rare cases whose spirit is actually seen, the other being Ichigo's and Hitsugaya's. Zabimaru is a nue (Japanese chimera in the form of a baboon with a snake's head for a tail), hence his name. Zabimaru has tattoos similar to Renjis' tattoos. Renji is very fond of his Zanpakutō, to the point where he easily gets agitated upon learning that it's gone or stolen without his knowledge. Zabimaru's spirit is portrayed as battle-loving and proud, similar in personality to Renji. It insisted on fighting Zangetsu again after losing, confident that it could succeed on the second attempt. Both the snake and baboon are capable of speaking (albeit usually in a finishing-each-other's-sentences manner), though the baboon is usually the more dominant one. The snake seems to be the more violent of the pair. Zabimaru's sealed form resembles a typical katana. It has a rectangular bronze handguard with a jagged design to it and a red handle and sheath.
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Shikai: Zabimaru's Shikai command is "Howl" (咆えろ, hoero; "Roar" in the English dub). In its Shikai, Zabimaru transforms into an even longer 6-part segmented blade; each segment is wider than the one preceding it from the hilt with 2 pick-like protrusions on the front and back of each segment, with the ones on the front much longer than the ones at the back.[10] The segments are connected by a stretchable thread, making Zabimaru more useful as a whip than an actual sword, though it can serve as a regular sword just as easily, thanks to Renji's swordsmanship. Zabimaru's guard and handle pretty much remain the same in its Shikai release. While Zabimaru can be stretched to incredible lengths in its whip form, Renji has a limit of three consecutive attacks before having to bring the segments of Zabimaru back together for recovery - which makes him fairly vulnerable during the time interval. To make up for this, Renji usually relies on Shunpo for evasion as he retrieves Zabimaru's segments. Renji's Shikai, while durable to an extent, can ultimately sustain serious damage the longer the fight drags on. Not that it can't withstand dangerously prolonged combat, but even it has limits in enduring high-level attacks that were conducted by either the enemy or by Renji himself. Because of these many drawbacks, Renji states that out of all the other Zanpakutō wielded by the other Lieutenant Shinigami, Zabimaru is the most difficult to master.
Shikai Special Ability: Zabimaru has a special technique rarely used known as:
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Higa Zekkō (狒牙絶咬, Bite of a Broken Baboon's Fang): Renji can also use his spiritual power to separate the segments and surround an opponent with them, allowing him to execute a one-shot omni-directional attack, but states that it is damaging to Zabimaru and leaves Renji defenseless. However, Renji could have merely meant he didn't have enough spiritual energy to reform Zabimaru at the time as during the battle against Baishin, Renji attacked Baishin using the technique, and was seen afterward with a complete (unbroken) Zabimaru.
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Bankai: Hihiō Zabimaru (狒狒王蛇尾丸, Baboon King Snake Tail): transforms Zabimaru into a massive version of its Shikai form resembling a skeleton of a snake. Zabimaru gains many more segments, which are much larger resembling a mix between a snakes vertebral column and the pick-like protrusions of his shikai segments, and it also gains a snake-like head about the size of a small car. Renji is also slightly transformed, gaining a fur cowl around his neck. The cowl appears to be the fur of an ape and thus, the ape's skull could be seen over Renji's left shoulder while the rest of the fur extends to cover his right arm. Zabimaru itself, in Bankai form, does not literally "cut;" Renji usually catches his opponent with the snake-head of his weapon and smashes his opponent into the ground with it. The head has also proven capable of inflicting heavy damage through biting.
Bankai Special Ability: Zabimaru also gains special techniques when in Bankai form such as:
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Bankai Reconstitution: Unlike its Shikai, Zabimaru's segments are held together by Renji's spiritual power, allowing him to separate and reattach them at will. The segments themselves are extremely tough, making it extremely difficult to destroy Hihiō Zabimaru. Even if a segment is damaged, knocked off, or even destroyed, Renji can simply detach it and reform (or reconstitute) Zabimaru.
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Hikōtsu Taihō (狒骨大砲, Baboon Bone Cannon) after Renji becomes more adept with using his Bankai. The technique fires a dense blast of concentrated spiritual energy from Zabimaru's mouth. Unfortunately, the technique costs a substantial amount of energy from Renji which usually causes an aftermath that breaks the segments out of formation.
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Enhanced Higa Zekkō: He can also use a much more powerful version of Higa Zekkō, where all the segments detach, glow and sharpen using spiritual energy. Surrounding an opponent to execute a omni-directional attack of blades of spiritual energy. After use of this attack Hihiō Zabimaru reconstitutes itself.
Source ::
Bleach Wikia 
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