Question: What is the name of the character who is followed in the Netflix series in which James Callis is the voice of Alucard?  

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Gaius Baltar: Dr. Gaius Baltar is a fictional character in the TV series "Battlestar Galactica" played by James Callis, a reimagining of Count Baltar from the 1978 "Battlestar Galactica" series.  He is one of the show's primary characters.

Angels and Devils (Numbers): "Angels and Devils" is the 23rd episode and the fifth season finale of the American television show "Numb3rs".  In the episode, Federal Bureau of Investigation (FBI) agents search for a mathematician who has been kidnapped by a cult leader.  The episode ended with a character's priorities changed and a marriage proposal left unanswered.  James Callis guest-starred as the cult leader, Mason Dureya.

Reuniting the Rubins: Reuniting the Rubins is a 2010 film directed by Yoav Factor and starring Timothy Spall, Rhona Mitra, and James Callis.  The majority of the film was shot in Radlett, Hertfordshire, England and South Africa.

Castlevania (TV series): Castlevania is an American adult animated web television series based on the 1989 video game "" by Konami.  The series follows Trevor Belmont, who defends the nation of Wallachia from Dracula and his minions.  Originally planned as a film with a script written by Warren Ellis in 2007, the project entered development hell until about 2015, where it was finally funded with help from animation studios Frederator Studios and Powerhouse Animation Studios, along with Netflix.  Its art style is heavily influenced by that of Japanese anime and Ayami Kojima's artwork in "".  The series premiered on the Netflix streaming service on July 7, 2017, and was renewed for an expanded 8-episode second season on the same day.

Helen of Troy (miniseries): Helen of Troy is a 2003 television miniseries based upon Homer's story of the Trojan War, as recounted in the epic poem, "Iliad".  This TV miniseries also shares the name with a 1956 movie starring Stanley Baker.  It stars Sienna Guillory as Helen, Matthew Marsden as Paris, Rufus Sewell as Agamemnon, James Callis as Menelaus, John Rhys-Davies as Priam, Maryam d'Abo as Hecuba, as well as Stellan Skarsgård as Theseus.  The series was entirely shot on location in the islands of Malta.

James Callis: James Nicholas Callis (born 4 June 1971) is an English actor.  He is best known for playing Dr. Gaius Baltar in the re-imagined "Battlestar Galactica" miniseries and television series, and Bridget Jones' best friend in "Bridget Jones's Diary" and "".  He later reprised the role in 2016, in "Bridget Jones's Baby."  He joined the cast of the TV Series "Eureka", on Syfy, in 2010.  In 2017 he voiced the character Alucard on the Netflix series "Castlevania", based on the video game of the same name.

Alucard (Hellsing): Alucard (アーカード , Ākādo , alt.  "Arucard" (English pronunciation "Alucard")) is a fictional character and the protagonist and antihero of the "Hellsing" manga and anime series created by Kouta Hirano.  He is a vampire and is devoted entirely to the current head of the Hellsing family (Integra Hellsing during the timeline of the story) and good friends with Walter.  He also feels admiration towards his fledgling, Seras Victoria.  Alucard works with the Hellsing Organization against other vampires and evil forces.  He fights with ferocity and often extreme cruelty, rarely killing until his target has been disabled and humiliated, while frequently allowing enemies more than one chance to kill him (though he seeks only to be killed by a human, having grown bored of immortality and life).

Count Alucard (character): Count Alucard is a fictional character created by American filmmakers Robert and Curt Siodmak for their 1943 horror film "Son of Dracula".  Like his father Count Dracula, Alucard is a vampire, a mythological creature that lives by sucking the life force from living creatures.  Alucard was first performed by Lon Chaney Jr. in "Son of Dracula" and has since been featured in other movies, comics, television shows, video games and other forms of media.  The name "Alucard" is "Dracula" spelled backwards.

Beginner's Luck (2001 film): Beginner's Luck is a 2001 British drama film directed by James Callis and Nick Cohen and starring Julie Delpy, Steven Berkoff, Christopher Cazenove, Fenella Fielding and Jean-Yves Berteloot.

House by the Lake: House By the Lake is an upcoming American horror film directed by Adam Gierasch and written by Josh Burnell.  The film stars James Callis, Anne Dudek, Michael Bowen, and Amiah Miller.

Supporting paragraphs: James Callis Castlevania (TV series)
Answer: Trevor Belmont