Adrian Fahrenheit Tepes, better known as Alucard, is the dhampir son of Dracula. Despite having debuted in Castlevania III: Dracula's Curse as a supporting character, Alucard was reintroduced as the main protagonist of Castlevania: Symphony of the Night, his most well-known appearance.
As the offspring of an unnatural bond between Dracula and a human woman named Lisa, Adrian had special powers and was destined to be stronger than any human but not potentially as strong as his father. After Lisa was killed, having been mistaken for a witch, Adrian grew up under the influence of his father, whence he was taught in the dark arts and molded into a warrior who would one day fight for the side of evil.
Adrian's existence did not come without quirks, as the gentle, human side of his mother always seemed to cloud his "better judgement", as Dracula would have put it. At her death, Adrian was by his mother's side. She insisted that he not take his anger at her death out on the humans, as their lives are already full of hardship. With those words, she had a profound influence on Adrian's thinking. His mind wandered as he questioned his father's will. After standing by for as long as he could, he broke away from his father's army and disappeared. Understanding that Dracula was going to impose his wrath on the people, Adrian would turn his efforts toward destroying his father's army, hopefully encouraging him to reconsider. Furthermore, he chose to go under the name "Alucard" –Dracula's name in reverse– to represent that he stood for beliefs opposite those of his father.
Alucard is an adept swordsman and typically wields one-handed swords. Alucard's other attacks use dark magic. As a shapeshifter, Alucard can change himself into a bat, a wolf, or even mist.
Genya Arikado is a member of a top-secret Japanese government agency. He was quick to inform Soma Cruz that he must reach the throne room when he finds himself mysteriously trapped inside Dracula's Castle, which has been sealed by a solar eclipse. Arikado is a frequent visitor to the Hakuba Shrine and an associate of Yoko Belnades.
In 1476, when Trevor C. Belmont was on his own quest to hunt out the Count Dracula, who had manipulated his son into fighting for evil, Alucard would be waiting for Trevor Belmont to come by. Alucard acted like a boss at this point, testing the skills of the hero. Alucard was surprised by Trevor's strength when he was defeated and asked if he could join Trevor on his quest.
After helping to destroy Dracula, and despite his good intentions, Alucard couldn't help but feel guilty for having committed patricide. To ease his pain, he put himself to rest, submerging his powers.
In 1797, due to the unexpected lack of a Belmont, Alucard had no choice but to awaken from his slumber to investigate the matter and infiltrate Castlevania. He discovered Richter Belmont had been seduced by evil and was controlling the castle.
With the help of Richter's kin, Maria Renard, they were able to find out the truth: the dark priest Shaft was controlling Richter and wanted to raise Dracula from the dead. After releasing Richter from Shaft's control, Alucard entered an upside-down version of Castlevania, with more powerful enemies, and confronted Shaft.
Having defeated Shaft, Alucard discovered that his efforts were in vain, as Shaft's plan had come to fruition regardless. He defeated his father in single combat once more and sent him back to the grave, though Dracula did show a spark of humanity after Alucard told him Lisa's last words: that mankind should be left in peace and that she would always love him. He then planned to put himself back at rest but Maria, who had developed a strong attraction to him, set out to convince him to stay.
One year after defeating his father, an incubus named Magnus attempted to convince Alucard to return to the side of evil. Alucard resisted Magnus' efforts and aided Maria, Richter, Cyril and Alexis in their fight against Magnus.
Magnus revealed to Maria Alucard's history of consuming human blood, including his turning of Lyudmil, his old servant, into a vampire. When questioned by Maria, Alucard did not deny these accusations. Lyudmil was manipulated by Magnus into fighting Alucard.
Arikado makes recurring appearances in Aria of Sorrow. There, he tries to provide helpful information to Soma Cruz while he roamed around the castle.
At the start of the game, Arikado appears at the entrance after Soma awakens and Mina introduces them to each other. Arikado then informs Soma that they are currently in Dracula's Castle, which is located inside the eclipse. However, before he can explain the situation further, they are attacked by a group of Skeleton Knights and Winged Skeletons. Arikado manages to kill most of the monsters using his power; however, one of the Winged Skeletons manages to avoid Arikado's attack, allowing it to attack Soma and Mina. Fortunately, Soma uses his pocket knife to kill it, somehow gaining the power of the monster's soul in the process. Arikado reveals that Soma has awakened the power to absorb the abilities of the monsters he kills and tells Soma to go to the Master's Chamber in order for him and Mina to leave the castle. Arikado places a protective barrier around the entrance, creating a safe place for Mina and allowing Soma to explore the castle without worrying about her safety, though points out that despite the barrier, death will most certainly find those that stay in the castle for too long and only Soma can save her from a painful death.
If Soma talks to Mina after this, he will ask her about Arikado. She tells Soma that she heard that Arikado does something related to national intelligence and explains he has been coming to Hakuba Shrine for years. She also tells Soma that Arikado is an unusual man who's face has not changed or aged in the 10 years she has known him.
Yoko Belnades mentions him when she first meets Soma, though at first she refers to him by another name before correcting herself, hinting that Genya Arikado is an alias, though Soma does not seem to notice. Yoko explains the reason Arikado is looking after him is due to them sharing the same dark powers.
After Yoko is stabbed and injured by Graham Jones in the Underground Reservoir, Arikado arrives and tells Soma he will tend to her wounds while Soma deals with Graham, who has gone to the Master's Chamber. If Soma goes back to the entrance after this, he will find that Arikado has left the injured Yoko there with Mina and Hammer after treating her injuries.
If Soma manages to defeat Graham in the chamber with the three souls that represent Dracula's powers, he will discover the true nature of his power and calls for Arikado to show himself. Arikado will tell Soma to travel to the Chaotic Realm and defeat Chaos.
Before the fight with Chaos, Arikado joins his powers with Mina, Hammer, Yoko and Julius Belmont to contact Soma and encourages him to defeat the foe.
After Chaos is defeated, Arikado congratulates Soma for defeating it before commenting that in the future someone may follow in Dracula's dark footsteps and perhaps they will meet again at that time. Arikado bids farewell to Soma and thanks him in his mother's name.
Genya Arikado makes yet another appearance in the sequel of Aria of Sorrow. When Soma is attacked by Celia Fortner, Arikado shows up to assist him. However, Celia erects a barrier, preventing him from using his powers to help Soma. Arikado manages to throw Soma a pocket knife to defend himself. Soma defeats the monsters and is surprised when he absorbs their souls. After Celia retreats, Arikado explains that Soma's Power of Dominance never actually left him and that his powers simply appeared as a result of Celia's attack. Arikado explains that she is part of a growing cult that is planning to create a new Dark Lord. He assures Soma that he and his colleagues will handle the situation. However, Soma is not willing to be left behind and with Hammer's help, he manages to find Celia's headquarters, which is a replica of Dracula's Castle. Soma later meets Yoko and Julius, who explain that they arrived there following a tip from Arikado.
Later, at the Demon Guest House, Arikado angrily confronts Soma for defying his orders. Soma is surprised to see Arikado, who was supposedly protecting Mina, to which he explains that he left Mina's protection to his subordinates. Soma inquires as to why he is still treating him as if he was still the Dark Lord, to which Arikado responds that because he is Dracula's reincarnation, he is still considered to be potentially dangerous. However, Arikado admits that since Soma is already at the castle, he can't really stop him and allows him to remain, albeit under his supervision. Soma thanks Arikado for letting him help and the latter gives him a letter and a special Talisman from Mina. After he reads Mina letter, Soma explains to Arikado what he had learned about Celia's plans. Soma tells him he will continue on his way to reach the top floor and Arikado tells him that meanwhile he will work on tracking down Dario's whereabouts.
If Soma defeats Dario, Arikado will appear to warn Soma to get away from Dario as he loses control of Aguni's power and is consumed by fire. Arikado explains that Dario couldn't resist the demon as it had fused with his soul. He goes on to explain that Dario's life could have been saved if the demon was cut free of his soul. Soma asks what happen to Celia and Arikado explains that she has escaped and he has his men tracking down her whereabouts. As Arikado and Soma are leaving the Castle, Soma stops and Arikado asks what is wrong, only for Soma to say it is nothing and that he just felt something odd for a moment. Arikado asks if anything odd happened in the Castle and Soma tells him about Dmitrii's soul going into him like a monster's soul when its under domination. Arikado says they will have to investigate the matter further, before telling Soma they need to meet Yoko and head for the Church. Soma asks if something is happening to him and Arikado says they will know some enough. Soma and Arikado then leave Celia's abandoned Castle resulting in the Good Ending.
If Soma confronts Celia in the central room of the Garden of Madnessafter defeating Aguni without wearing Mina's Talisman, Celia will kill Mina and, in his anger, Soma will be consumed by darkness, becoming the new Dark Lord. Arikado, standing at the entrance with Julius, will comment on how they have failed and the Dark Lord has returned, with both men prepared to face the revived Dracula, resulting in the "bad ending".
If Soma confronts Celia while wearing Mina's Talisman, Soma manages to resist being consumed by Dracula's influence long enough for Arikado to arrive and point out that the Mina Celia killed is actually a Doppelganger disguised as her, foiling Celia's plan. However, Dmitrii's soul uses the Doppelganger's body to create a new one for himself and reveals that, while inside of Soma, he managed to copy his Power of Dominance before fleeing with Celia into The Abyss. At the entrance to the Abyss, inside the Mine of Judgement, Soma finds Arikado and Julius waiting for him. Arikado has Julius use his power to open the seal preventing them from accessing the Abyss, although this leaves Julius unable to fight anymore. Arikado and Soma confront Dmitrii as Celia is sacrificed as part of a ritual to increase his Power of Dominance to match Soma's, with Arikado being injured by Dmitrii as a result of the aforementioned sacrifice despite his efforts at preventing Dmitrii from taking control of a calamitous demon. However, Dmitrii is unable to properly contain all of the monsters' souls and they all slowly merge together within him, ultimately forming a single soul with all of their powers combined into an entity known as Menace. Before his death, however, Dmitrii shoves Arikado out of anger and agony when the latter deduced he can't actually control the demons inside him despite copying the Power of Dominance. If Soma defeats Menace, this results in the "true ending", where Arikado comments that if the existence of a Dark Lord is required someday, then one will appear.
In Julius Mode, Arikado appears as a playable character. Julius Mode acts as a continuation of the game's "bad ending" and deals with what happened after Soma was consumed and became the new Dark Lord. In order to combat the Dark Lord, Arikado releases his true power and becomes Alucard once more. As Alucard, he meets Julius and Yoko in the Demon Guest House and joins forces with them to defeat Soma. They eventually find Soma/Dracula in his throne room in the Abyss and engage him in battle. After defeating Soma, he transforms into True Dracula. After True Dracula's defeat, Arikado stands alongside Julius and Yoko as they watch the castle collapse in silence.
He is reprised by Yuri Lowenthal in the English dub and Ryotaro Okiayu in the Japanese dub.