O my this looks interesting. Don't mind if just plop this here...

Name: Cú Chulainn (Lancer)

Age: Immortal, (Unknown)

Universe: Type-Moon

Appearance: [url=http://www.zerochan.net/648691#full] See here [/url]

Powers: Lancer is a Heroic Spirit, summoned from ancient history into the modern world through the power of the Holy Grail. His physical manifestation gives him all the benefits a normal mortal would, plus a bit extra. And by a bit, I mean a lot. 

Heroic Spirits (Nowforth known as Servants) vary in power based on their accomplishments, how well they were known, and where they were summoned at. Lancer is rather on the weaker side of the servant spectrum, at least compared to the other servants he fought, however, he is still strong enough to where he could take on an army with ease. Mortal weapons, such as non-magical swords, guns, and etc, do not deal as much damage to a heroic spirit as they would a normal human. Powers akin to those of much stronger beings, such as weapons like Excalibur or feats of strength like of that of Hercules, are some of the few things that can deal damage to a servant. However. They are not invisible to mortal weapons- Do not get the wrong idea. The right man with a sword will be able to take on a heroic spirit and stab them through the chest- It is just incredibly hard to get to that point, and their armor

Because they are weapons, Servants such as Lancer are built purely for fighting- To the point where they are given special weapons from their history specifically to fight other Servants. Lancer's, or Cu's, in this case, is Gae Bolg. Gae Bolg can be used two pronged- Both at an incredible cost of energy. The first is known by full name; Gae Bolg; which is the true use of Gáe Bolg, is the largest and most powerful attack delivered using the spear. It is the “attack that unleashes countless darts at the enemy” that is spoken of in the legends. It is the attack that made him a hero which utilizes the full potential of the lance's curse, converting all of Lancer's prana into energy and releasing the accumulated power after the spear is hurled, detonating on impact with enough power to blow away a multitude of enemies.

The second of Gae Bolg's uses is an attack focused on a single target, created by Lancer to suit his own style, that strikes a fatal blow that always pierces the opponent's heart and ruins their body from within with its thousand iron thorns. It can be perceived as unavoidable attack, however, one of his might and strength could easily counter it- And on top of that, it requires a very large amount of prana to use practically.

Lancer obtained 18 Original Runes, Norse Runes, after studying magecraft under Scáthach in the Land of Shadows. He appropriately utilizes them to respond to different situations. One such rune, one with the purpose of searching, helps support his elusive actions during the Holy Grail War. Holding the Anzuz rune allows him to set a blaze to reduce an entire room to ashes. It is able to block a great Noble Phantasm in power.

Another use of multiple Runes is Ath nGabla, a seal formed by pointing his spear at the ground and carving four runes, Algiz, Nauthiz, Ansuz, and Ingwaz, in four corners around him. It is a curse of one-on-one combat passed down to the Knights of the Red Branch, and it does not carry any inherent magical energy. It is an arena formed from four brances, guaranteeing one on one combat with honor at stake. Warriors having set the seal no longer have retreat as an option, and all warriors who see the seal are not allowed to refuse combat. 

Lancer has a high rank in Battle Continuation due to the having fought from disadvantageous position in many fatal battles during his life, living on while charging through like panther. In this way, he can take blows that would kill normal humans, several of them, before falling. At one point, the entire left half of his body was ripped apart from the shoulder to the gut, and he was still able to move and fight. Of course, such wounds he cannot heal from, and will eventually die without a proper source of prana, it simply extends his life beyond that of normal.

Weaknesses: As Lancer was created by the Holy Grail, and is a spirit bound to this world, he requires Prana to be kept in this world. Prana, or mana, or whatever you will call it, is the magical energy that allows Lancer to use his abilities, to fight, and to stay in a physical form. Due to being cut off from a previous master, he needs a master who he can 'drain' energy from, such as a powerful mage, wizard, or similar caster. Without someone to drain energy from, and without a contract pulled between them, he will slowly dwindle away from the world, growing weaker and weaker until finally he will simply disappear. 

Brief Bio: Cu Chulainn is a Lancer class servant, created from the holy grail. His true identity, Cu Chulainn himself, is an Irish mythological hero who appears in the stories of the Ulster Cycle, as well as in Scottish and Manx folklore. 

His childhood name was Sétanta. He gained his better-known name as a child after he killed Culann's fierce guard-dog in self-defence and offered to take its place until a replacement could be reared. At the age of seventeen he defended Ulster single-handedly against the armies of queen Medb of Connacht in the epic Táin Bó Cúailnge. From there, his achievements were known as one who would live a short but everlasting life- And throughout his life time he achieved many claims to fame and heroic deeds that rivaled that of some gods. He was known as a fierce warrior who could turn into a form of insanity, an unrecognizable warrior who lost all sense of reason, but gained the strength of gods. 

He was eventually killed in a conspiracy against him, and fell at the hands of a bitter rival.

Other: He [i]needs[/i] a source of prana to survive. Without a master, he will slowly lose energy until he dies, plain and simple. In addition, the strength of his master will influence how much of his power he retains- If someone who has no idea what a mage even is decides to be his master, for instance, with a very low prana count, they will not only probably have to use ALL of their energy to sustain him, but he will also be several tiers weaker then normal, and unable to use either of his Noble Phantasms.