Abilities
As the guardian of Kumogakure and jinchūriki of the Eight-Tails, Killer Bee is an extremely powerful ninja, capable of overwhelming the entire Team Taka all by himself, and has had his skills praised by several Kumogakure ninja, including his older brother. Madara Uchiha claimed that he is the perfect host. Similar to how other jinchūriki obtain physical traits from their inner demon, Killer Bee is able to produce ink from his mouth, which he mainly uses to write lyrics when he is lacking of regular writing tools or to blind his opponent. As expected of a jinchūriki, Killer Bee has a very large reservoir of chakra, enough to make Samehada get very excited and turn against Kisame. During his time on an a island where he trained to control the Eight-Tails, Killer Bee tamed almost all of the island's beasts.

Taijutsu
Bee possesses immense physical strength and combat prowess, capable of disarming a skilled opponent like Suigetsu with his bare hands, and winning a sumō match against a giant bear. He is incredibly durable in battle, having received a solid kick to the neck from Sasuke Uchiha only to drop his sword and begin writing lyrics, escaping unscathed after being hit by Sasuke's Chidori, and blasted from behind with Jūgo's Boosting Jet Pistons. Killer Bee has a fighting style which is similar to that of the Raikage's because they both use wrestling moves instead of standard taijutsu. He supplements the speed and power of his taijutsu with his Tailed-beast cloak.

Kenjutsu
While originally only carrying two swords when he was young, Bee has developed his swordplay to an incredible level. Possessing a unique fighting style, Bee holds his seven blades in between the joints of his arms (left armpit, both elbows), right leg, stomach, the right side of his neck, and in his mouth. As strange as it appears, Bee is very skilled with this, spinning around like a buzz saw and overwhelming his opponent with all of the varying swings, giving him great versatility very similar to hip-hop dance which makes it difficult to predict his movement. When he finds an opening, Bee can impale his opponent with most of his swords quickly and simultaneously. Neither Suigetsu nor Sasuke could read his sword work, despite the former being a highly trained swordsman and the latter having the Sharingan. He is also capable of cutting through almost anything when he flows his lightning chakra through his blades. He can also use these blades as mid-range projectiles, and coat them with lightning chakra to slice right through the target. By covering himself with the Eight-Tails' chakra, he creates an "Eighth" sword.
Killer Bee also earned the likings of Samehada due to his high chakra level, and intends to use it as his main weapon, unaware that Kisame is hiding inside the monstrous blade.
Nature Transformation
During the battle with Sasuke he displayed the ability to flow lightning-natured chakra through his blades to increase their cutting power, similar to Sasuke's own jutsu. Killer Bee's prowess in Lightning Release techniques is so great, he can charge a sharp but weak pencil-point to pierce straight through a large tree trunk and even through the ground. As stated by Kisame, Killer Bee is able to do this by increasing the vibration frequency of his lightning chakra to surpass the standard penetrative force of wind chakra.
Jinchūriki Transformations
Like other jinchūriki, Killer Bee has the ability to create a chakra cloak by drawing on part of his demon's power. He can then form this chakra into the form of two horns, and use them to attack the enemy with a technique called Lariat. This attack has incredible speed and power, but the linearity of his movements makes him easier to predict. Because he has a strong relationship with his own tailed beast, it acts as his partner in battle, disturbing his chakra to dispel even genjutsu from Mangekyō Sharingan.
Like his fellow Cloud shinobi, Yugito Nii, Killer Bee is able to become his tailed beast with great ease. Unlike her, however, he can retain complete control even in this fully released state. He can also partially transform parts of his chakra shroud into parts of the Eight-Tails' body. When fully transformed, he can easily fire massive chakra blasts many times the size of its already giant body, but Killer Bee was forbidden from transforming by A. Bee makes it a point to ignore this order when he can, either when training or to fight formidable opponents.