Also, there are a few somewhat unique families in Konoha, that tend to use special fighting strategies and special Jutsu as standard. These are not Kekkai Genkai, but are interesting enough that brief histories of each will be posted here as well.
Note: The links are to clips of the bloodlines or clan abilities in use from Naruto-kun.com. Please don't view them over and over, as we're technically stealing their bandwidth.
Kekkai Genkai
Sharingan
---------
The Sharingan (literally "Copy Wheel Eye") is a special type of pupil that naturally occurs in some members of the Uchiha clan, which allegedly evolved from the Byakugan of the Hyuuga clan.
This multi-faceted pupil allows the character to perform several feats. First, the Sharingan's most well-known capability is its ability to memorize any technique that it is a witness to. It can memorize not only ninjutsu techniques, but also taijutsu and genjutsu as well (with some difficulties). The Sharingan also provides a unique brand of hypnosis that involves suggesting actions and thoughts to the opponent, although this is shrugged off without huge difficulty by experienced ninjas and is nothing compared to more powerful genjutsu. Third, it can see through most illusionary techniques such as Bunshin. Finally, it has the ability to predict (and copy to an extent) the opponent's movement as well as allowing the ninja to track high-speed objects with increased clarity.
The weakness of the Sharingan is that it drains chakra quickly. In order to copy a jutsu, one has to have the physical ability to perform the technique. For example, the user must have the needed amount of chakra, stamina, agility, or strength in order to perform the ability. In addition to physical skill, the Sharingan cannot copy any other bloodline abilities or summon a creature the user has not made a contract with. Finally, the Sharingan cannot copy skills that occur purely by Chakra manipulation, such as Rasengan or Physique Modification. It needs to have hand seals or some physical movement involved to be copied.
The Sharingan does not automatically appear from birth in a user. Instead, it will usually appear when the user is in a life-threatening situation, where the power of the Sharingan will save the person. After this first appearance, the user can then call up the Sharingan any time he or she pleases. The power of the Sharingan is judged through the number of comma-like dots (tomoe) in the person's eye. It is not unheard of for a Sharingan user to have different amounts of dots in each eye. Eventually, an "adult" and fully matured Sharingan has three dots in each eye.
For game terms, the Sharingan will only be able to copy Jutsu that have hand seals or other physical aspects, of which you already have the prerequisite statistics. Using the Sharingan in a fight will take 10 temporary stamina.
Shikotsumyaku
-------------
The Kaguya clan was responsible in the past for starting war against the Ninja of the Mist Village. Despite their bloodline limit (meaning "Corpse Bone Pulse"), they were almost entirely wiped out. The Kaguya clan has the frightening ability to manipulate their bones, protruding them out of the body, shooting them from the fingertips, or creating a layer of bone under the skin to serve as armor. These bodies are often referred to as being "perfect" and there is no pain involved in using this ability.
The users of the Shikotsumyaku are not limited to a set number of bones in their body. The offense of a Shikotsumyaku is usually related to taijutsu as with just a thought any point on the body can become as sharp as a sword's point. The Kaguya clan's most powerful techniques would be its many dances, which are both deadly and beautiful at the same time.
For game use, using this bloodline to do anything but create simple weapons (like a sword) will take 10 temporary stamina.
Byakugan
--------
The Byakugan is the highly secretive weapon of the Hyuuga clan of Konoha. Translated as "White Eye," the Byakugan appears as a white pupil and the veins leading up to the eye are intensified and visible. While the Byakugan is incapable of most of what the Sharingan is, the Byakugan surpasses the Sharingan in terms of insight.
The Byakugan is mainly used complementary to taijutsu. A person with the Byakugan has a 360 degree field of vision, except for a small blind spot that is difficult if not impossible to pinpoint. Byakugan users can passively detect anything that moves around them in a 50 foot radius, making them close-range combat experts. When actively used with chakra, the Byakugan can see through most matter over distances proven to be up to and past a mile.
In addition to its external vision, the Byakugan allows the user to view the chakra inner coil system of individuals, which controls the flow of chakra throughout their body. Using the noble house of Hyuuga's Jyuken fighting style, the Byakugan can exhibit superior control of their own chakra and use it to clog the exit holes of the opponent's chakra (known as "tenketsu"). Seasoned Byakugan users are able to deliver a fatal, single blow just as easily as cripple an opponent.
There are several techniques developed specifically for Byakugan users, which complement and make use of its abilities. One of these techniques is the Kaiten, which works to eliminate (temporarily) the blind spot of the Byakugan. There are many other attacks, and it is unknown whether the limit of the Byakugan has yet been reached.
For game use, using the Byakugan simply to have good insight and a 360 degree field of vision is effortless. However, it takes 10 temporary stamina to use the advanced forms of the skill, such as the Jyuken or seeing things a mile away.
Fluid Soul
-------------
A bloodline characteristic of the hidden village of Mist, users of this ability can mold water with only a slight use of chakra. This Bloodline as it is has very little known about it. However, the Demonic Ice Mirrors attack is one that is attributed to it. This technique consists of creating a hemisphere of very strong mirrors of ice around his opponent. The user then is able to enter the mirrors and can reflect themselves into all of the mirrors at will. This bloodline has not be heavily witnessed, although it is assumed that its wielders could concievably create water and ice in environments devoid of these characteristics and they have been shown to be able to manipulate water and create weapons such as needles out of water. Also, due to the Demonic Ice Mirrors attack, it is assumed that wielders of this bloodline can enter and exit water and ice at will.
What is possibly most deadly of this bloodline is a bizarre effect that affects the user with no drawback. A person imbued with this bloodline is capable of performing hand seals with only one hand.
For game use, using this bloodline to create hand seals with one hand is effortless, but using it to manipulate or create water for anything but the simplest weapons (such as Shuriken) takes 10 temporary stamina.
Kaigan
----------
The Kaigan, or "enlightened eye", is a pupil bloodline native to the hidden village of Grass, and one of their most powerful assets. Unlike most pupil related bloodlines, the Kaigan actually takes the appearance of a third eye, placed in the middle of the ninjas forehead. The name is derived from the interesting way in which the Kaigan eye "sees" things. Kaigan eyes do not see light in the way normal eyes do, or chakra in the way the Sharingan and Byakugan do. Instead, they see the spiritual world, the thoughts and emotions and feelings of those around them. These things take the form of colors the shape of the people and animals being seen, which has several advantages.
Not only can a Kaigan user know the mood and intentions of another person just by looking at them, by closing their real eyes they can tell where people and animals are behind solid objects, or whether or not a person is a clone (with only the Kaigan open, only things with emotions can be seen). Furthermore, if the user of the Kaigan manages to look into another persons eyes with it, they can exert their chakra in such a way to, to a limited extent, read anothers mind. Actual worded out thoughts won't be gleaned in this way, but the gist of them will, making users of the Kaigan nearly impossible to surprise.
In addition to that, it is said that when the Kaigan eye is closed, it looks inward, on the thoughts of the person using it. Closing the Kaigan eye focuses the ninjas attentiveness, much like meditation does. Kaigan users are said to have an enormous amount of common sense, and do not lose their cool in a situation easily. Closing the Kaigan eye also, to an extent, heightens the other, non-sight senses. Finally, if two Kaigan users stare into each others third eye for a few seconds, they can share thoughts and memories, as if for the time their eyes are connected they are thinking out of the same mind. This is a quick and excellent way to transfer information, but can also be quite traumatizing, as only one ninja has to be willing for the transfer to occur.
For game use, most uses of the Kaigan take no chakra to use, but in order to read anothers mind, be they Kaigan users or not, 10 temporary stamina must be spent at the end of the battle.
CLAN ABILITIES
Kikai Bugs
----------
The use of Kikai Bugs is nearly exclusive to the noble Aburame clan of Konoha. After birth, small Kikai (Destruction) bugs are introduced into the user's body system. These Kikai bugs enjoy a symbiotic relationship with their host. In exchange for being able to feed off of their host's chakra to a degree, the Kikai bugs offer their protection to the host.
The use of Kikai bugs is varied and complex to those who do not practice it. The Kikai bugs have shown themselves to be fascinating forms of tracking, Bunshin, and attack. From being able to drain an opponent to chakraless near-death in a few moments to creating masterful traps, the Aburame clan's Kikai bugs are not to be underestimated.
Baika no Jutsu
--------------
Mastered and guarded by the noble Akimichi clan, the Baika no Jutsu literally means "Multi-Size Technique." Although many young Akimichi boys and girls are teased for their size, it is often to their advantage upon maturation. This is a secret set of jutsu that use the individual's large weight and size and multiply it for use in specialised jutsu. The Baika no Jutsu is largely related to taijutsu combat, yet while this may seem less than the more celebrated taijutsu traditions such as jyuken, the Akimichi's abilities are surprising and terrific in their own right. Rumors abound of a secret food-related trump card of the Akimichi clan that is only revealed when there is dire need of its abilities, but this remains just an unfounded rumor.
Ninken
--------
The use of Ninken has been related to the Inuzuka clan for many years. These ninja-dogs are often given to a member of the clan at birth or in their youth, creating a bond between the two unlike any other. The members of this clan are capable of communicating with their canine companions, allowing the members to gain information from their companion's heightened senses. Inuzuka individuals are also usually capable of generating chakra in their nose, increasing their sense of smell a thousandfold.
The jutsu of a person who uses a Ninken is often related to involving their partner, such as the Gatsuuga and Beast Clone techniques.
