BEWARE YE READER - MAJOR SPOILERS ABOUND

Darc comes from the PS2 game Arc the Lad: Twilight of the Spirits. When the game first starts out, we see a world with two races, the humans and the Deimos, who have been at war with each other since before anyone can remember. Both races depend on spirit stones, a depleting energy resource that humans use for technology and Deimos for their magic. Here's how DDD's Deimos King played his part:

(Note: There is a sequel to Darc's game called Arc the Lad: End of Darkness that takes place five years after it ends, but it was of lesser quality than the first and didn't really include Darc at all except by mention. Few aspects of/leading up to End of Darkness will be included in DDD.)

Darc's story (simplified - for those just looking for a bit of basic backstory - more detailed version after the part about Darc's combat abilities)

As a result of being of mix-blood heritage and his parents being separated by fate as it were, Darc was raised by his father Windalf. They were constantly on the run from Drakyr - Windalf's own tribe - due to him possessing one half of their treasure, the Wind Stone. When Darc was around age 10 (mun's guess), Windalf succumbed to injuries and passed away. Darc almost died of starvation afterward, but was saved by a witch named Geedo. Unfortunately she enslaved him, and filled the next seven years of his life with agony.

Eventually he managed to befriend Delma, a Deimos from the nearby Orcon tribe. Together they worked and together they were tricked by Geedo and the Orcon chief/Delma's foster brother Densimo. Darc defeated them, though his wings were ripped off. He vowed afterward to become the strongest Deimos and unite his people under him.

Darc continues to fight against the humans as well, and through one such human girl named Lilia (that he develops a crush on) he finds out about a way to give him more power. He pursues it of course, and in the process is reunited with his estranged twin brother Kharg, though they both attempt to kill each other. Eventually they defeat an evil empire that was attempting to take over the world, and also the Spirit of Darkness that was pulling the strings the entire time. In the process, almost all of the spirit stones in their world lost their power. Darc and Kharg make a sort of alliance, and vow to try and create peace between their people.

DDD canon

Darc joined roughly one year after the events of the game (September 15, 2007). He was given a laptop by Tatjana, a scientist and one of the humans that joins Kharg's party. How it accesses the Internet/multiverse is unknown to him, and he's been unable to contact Tatjana since. In fact, he's been busy, and unfortunately hasn't seen much of his canon friends for a while. One of his main goals on the community is to try and find a new power source that the Deimos can use for their magic. The mun made his birthday June 17th, thus making him 19 currently. He travels around a lot as he helps his people rebuild and forge alliances with humans, though he stays in Rueloon and Orcoth most often. Rueloon is currently the only Deimos city that is open to humans.

Yuuri (when he was played by Maraich) and Wolfram were the first off-worlders to visit him. Darc and Yuuri felt they shared quite a bit in common, and thus met to try and create an alliance between their worlds. Wolfram followed to make sure Yuuri wasn't having an affair.

His first visit to another world was a trip to Honiara Beach, followed by heading up to the North Pole with Jack Frost. (This was also his first Christmas, though he can't seem to find Lilia so he can give her the present he had made.)

Not long afterward, he was on the jury for Genie's trial.

When Hades left the Underworld for vacation, the ghosts of Darc's parents visited him and left a message on his LJ.

In March 2008, he hosted a tournament in the city of Rueloon and invited guests and participants from all worlds. Following that he took Philomel to learn about the Dragons and Drakyr of his world.

When Shukaku was released and attacked Hidden Sand Village, Darc went to help defend the village with his airborne steed Pyron.

Michaelangelo taught Darc how to worldhop so that he could try and shake General Klaus into believing in other worlds. (It didn't work, but at least he learned to worldhop.)

With his newly acquired worldhopping abilities, he transported Kaito to Luna's house to help look for her wand.

He had a fight (thread unfinished) with Sol Badguy. I think we decided that Darc lost.

Viruses that have hit Darc:

The Truth Virus - caused him to admit to the community that he really is in love with Lilia.

The Eros Day Virus - caused him to feel what everyone else that day felt.

The "Hakuna Matata" Virus - caused him to let go of his anxieties and insecurities for a day. (He went sledding with Gaara and Jack Frost.)

The (2nd) Family Unit Virus - Philomel St. James became his mother, Luna Lovegood his sister and Lyra Silvertongue his cousin.

The (2nd) Genderswap Virus - Darc turned into a girl. He went to hide out with Philomel and ask her about girly things.

Darc's good friends from the community: Jack Frost, Haku, Gaara, Luna Lovegood, Philomel St James, Kamina

Personality:

Although he really is a strong person, Darc has a tendency to put up a tough front. His subconscious "divison" between his human side and Deimos side is more prominent than Kharg's, but neither side is really more prominent than the other. He instinctually loves a good fight and takes pride in his power. If he doesn't trust someone or if he perceives them as a danger, he won't be afraid to make death threats. However, he does have certain insecurities, and though he tries to hide them through said tough front and locking entries, they do show. (At such times, he has a habit of touching the birthmark on his right arm.) Darc also has a kind streak in him, such as (in-game) when he finds a Firble and hides it, knowing that Densimo would want to eat it. (They refer to this as his "human heart" in the canon.) He has separation anxieties after losing both of his parents, but he knows he has friends now. (He just wouldn't be able to bear losing them.) This would probably make being alone his biggest fear.

Combat Abilities:

Darc is proficient with a sword, though he developed his own style of fighting with it since he was never trained. (The sword itself he picked up off the ground.) Wind is his element, and he has a wide variety of magic spells at his disposal, and special techniques too seeing as he is also part human. The downside is that he requires Spirit Stones to use them. Luckily, he has an item called a Romantic Stone which allows him to cast magic without them. He would rather not depend on it so much, however.

(The mun is trying to balance the in-game spells that Darc has along with his abilities seen in cutscenes, as he seems to have a more diverse control over his powers outside of the playable spell list.)

Darc's story (canon, TL;DR version - for omnipotents/psychics and those who want more of the gritty details)

Darc and his twin brother Kharg were born from the first human and Deimos to set aside their differences and fall in love; Windalf of the Drakyr Deimos tribe, and Nafia who was a descendant of local nobility. Only the Drakyr knew about them, causing the lovers to take the Wind Stone (a Great Spirit Stone and treasure of the Drakyr) and run from the tribe's wrath. While fleeing, Windalf carried Darc and Nafia carried Kharg. Eventually they were separated in such a manner that each believed the other to be dead. While Nafia managed to return to her town with baby Kharg, who grew up looking like a regular human, Windalf and Darc were not so lucky.

Windalf raised Darc on the run, as they were constantly being pursued by Drakyr scouts. Darc very much looked like a half-breed, which meant he couldn't blend into other Deimos communities. When he was approximately 10 (mun's guess), his father sustained life-threatening injuries. The two of them managed to escape across a wasteland to the ruins of a church that stood by the sea. It was there that Windalf died, but not before passing on his half of the Wind Stone to his son. Darc buried Windalf and hid the Wind Stone in the pile of rocks he placed as a marker atop his father's grave. A combination of the effort in doing so with having no food or water to speak of caused him to collapse, half-dead, at the side of the road.

An ugly Deimos witch named Geedo found and rescued Darc, but she also enslaved him. In order to counter his growing wings which he would've been able to escape with, she placed a collar on him that would constrict on her command. Thus he passed the next seven years or so of his life, working for and being beaten by his new master. On occasion he would have to go into the nearby Deimos town of Orcoth to fetch her things; all the inhabitants would mock him, calling him a "Deimos wannabe". All the time, he saw his father in his dreams, telling him to save the Deimos, but nothing more.

Things took a turn during one of such errands. Somehow, Darc managed to strike up a sort of alliance/friendship with an Orcon named Delma. The two of them, along with the Orcon chief/Delma's foster brother Densimo, managed to fend away invading humans and beat up on some Drakyr. Little did Darc know that Densimo was actually in on a plan with Geedo and the Drakyr who were looking for the Wind Stone; they managed to trick Darc and, in the process, his wings were ripped off. Darc realized that Deimos only understand power and don't make "friends", and he decided to harden his heart. He killed Densimo, Geedo and the other Drakyr, and swore that he would do as his father wished: he would save the Deimos, and decided to do so by becoming the strongest of them all, uniting all the tribes under him as their first true king. Killing Densimo helped as that made him the new Orcon chief. Delma made her own plans upon seeing what Darc did to her brother.

So Darc set about trying to gather a team of strong Deimos to help him with his plan. Volk of the Lupine matched his criteria, and when a human airship crashed in Orcon territory, they went to go check it out together. After going through the forest, Darc found a human girl - escaped from the airship - but before either of them really had time to react, Delma tried to kill Darc out of revenge for Densimo; she didn't notice the human. As it turned out the human girl, Lilia, was kind-hearted and took care of Darc's wounds despite her fear of him. (He retains a crush on her throughout the game after this.) One of the Spirits, the Light Spirit, visits them and gives them a message. Since Darc only ever saw the Wind Spirit before because he owned the Wind Stone, he deducted that Lilia must have the Light Stone.

Darc's deduction was correct. Lilia was on the run from the Dilzweld Empire, run by Emperor Darkham, which was attempting to take over the world and collect the five Great Spirit Stones; it was said that in human hands, the stones would give them access to the Ultimate Weapon, and with Deimos, it would turn their possessor into the Ultimate Deimos. Thus Darc added "become the Ultimate Deimos" to his agenda, and sets out to collect the Great Spirit Stones as well as unite the tribes. Lilia seems to be tossed back and forth between Darc's party, Kharg's party and being a Dilzweld prisoner, but she still manages to keep the Light Stone for the most part. On his end, Darc collects the Water Stone from the Coleopt tribe and keeps his half of the Wind Stone. (Kharg gets the Fire Stone and his part of the Wind Stone too; Dilzweld already has the Earth Stone.) Darc eventually learns more about his past from his estranged and bitter grandfather Williwo, though he's told that Nafia came to the Drakyr weaken their tribe and steal their stone, and Windalf fell for it. He is also told that Nafia and his twin brother are dead.

The Water Stone is eventually taken from his party by an experimental Deimos created in Dilzweld's labs named Droguza. When Darc sneaks aboard the main Dilzweld mothership to try and get it back, he learns that Lilia and a woman sharing his mother's name are prisoners, but he only has time to either retrieve the stone or save Lilia. He picks Lilia, and finds that the woman doesn't just share her name - she is his mother. At first he refuses to help Nafia because of what Williwo told him, but Lilia refuses to go with him unless he brings Nafia too. Darc concedes, and fights a few random guards on the way out. As they leave, one of the guards tries to shoot Darc as a last ditch attempt to stop him. Nafia takes the bullet instead. They escape to Yewbell, Nafia's hometown where Kharg was raised, much to the absolute horror of the townspeople. (Especially since Nafia, without an ounce of shame, tells the guard at the gate that Darc is her son.) They go back to her house, where Darc releases much of his pent-up rage upon his dying mother. She takes it and tells him that she still loves him no matter what, but also that he must go to the Cave of Truth on Cragh Island. When she dies, Darc tries to beg for her to wake up and for her not to leave him all alone, but he still has to bury her in the end.

He and Lilia go to Cragh Island to find that the inhabitants are humans and sentient monsters (Slothians) that live peacefully together, and are confused by the idea of the two not getting along. It is in the Cave of Truth that Darc and Kharg first meet, and Lilia had to stop them from trying to kill each other. In the centre of the cave, they speak to the Spirit of Hope, and learn that the Spirit of Darkness is gaining power again from all the negative emotions in the world caused by the wars between humans and Deimos. If it continues in such a manner, the Spirit of Darkness will be able to escape its seal and terrorize the world again. Both Darc and Kharg are skeptical, as they still don't believe it's possible for their two races to coincide. They fight again, and Lilia has to stop them again. Then she gets kidnapped by Dilzweld again, and both parties find their way to Maluise Tower, apparently the control centre for the legendary Ultimate Weapon. Dilzweld attains all of the Great Spirit Stones at this point, save for Kharg and Darc's halves of the Wind Stone.

Kharg's party arrives first, and they defeat Darkham, but not before he awakens the Ultimate Weapon (a.k.a. the Flying Castle) and destroys a distant metropolis with it. Once Darc and his companions arrive, there is a final showdown between both parties at the top of the tower. (The player is given the option of picking which party they'd like to play as.) Regardless of which party wins and attemps to finally lay claim to all five Great Spirit Stones, the Spirit of Darkness reveals itself in the form of an explorer (known to Kharg's party) that became possessed with a small part of its power. It takes the Great Spirit Stones and Lilia as well, as she is revealed to be the reincarnation of a "friend of the Spirits"; her combined with the stones will be able to open the seal on the arc containing the Spirit of Darkness. Once he departs, each party enters the Flying Castle one by one.

After a series of events, including one floor collapsing and causing two mix-race parties to assemble, the humans and the Deimos agree to work together, if only to save their world. They arrive in time to find that the Spirit of Darkness has already been released, becoming the Lord of the Black Abyss. It sends them into a nightmare world in which they all overcome the illusions of despair that it creates. One of the monsters contains Lilia within it, and killing the monster would mean killing Lilia; they do so, but she is brought back by two ancient spirits who help her and the others escape the illusion world. Together they defeat the Lord of the Black Abyss, but it tells them that it can't actually be killed so long as the other spirits reside in the mortal world as well. Enter the few remaining spirits, who tell everyone that they will return to the Spirit World in order to get rid of the Spirit of Darkness forever.

The world is saved, though the new problem is that with the spirits gone, the vast majority of Spirit Stones in the world had become powerless. Kharg and Darc both resolve to carry their races through whatever hardships come their way. Darc, now King of the Deimos, agrees with his brother to try and bring peace between their people.

(Darc's party at the end of the game: Darc, Delma, Volk, Camellia, Bebedora, Choco (secret unlockable character))