Hector (ヘクトール) is the Warlock of Melancholy. Currently, not much is known about him. He has some importance in Roswaal's and Echidna's backstories as well as to the origin of Sanctuary as he was the reason for its creation.
Roughly 400 years ago, he pursued Echidna to Sanctuary, where he swiftly defeated Roswaal's ancestor, Roswaal A Mathers, and engaged the Witch of Greed. The outcome of their fight, as well as his current status and whereabouts are unknown. His name seems to be completely absent from historical records.
Hector had the look of a young man around twenty years of age with a tall body and slender frame. His long messy charred-brown colored hair was tied into a braid that trailed down to his butt. His black eyes had heavy bags under them that gave off the impression of a sickly person. His mouth was slightly puckered and his cheekbones were fairly pronounced. The color of his face was poor and his posture was crooked, which, when coupled with his worn eyes, gave the impression of someone who found it demanding to put on clothes and leave the house. Indeed, every part of Hector's demeanour portrayed lethargy and a general lack of vitality. Rather paradoxically, despite the lack of joviality conveyed by his attitude and posture.
Contrary to his facial features however, Hector wore a rather colourful attire; that of a jester. Half of it was purple and half of it was white. The suit was extremely skinny and left his shoulders visible.
In the anime, he's surrounded by a purple distorted hue which somewhat resembles a force field.
As the Warlock of Melancholy, Hector has a negative personality, frequently expressing his negativity in words. His manner of speaking is similar to Roswaal with the original Roswaal himself starting to speak like him later on after being through the situation. Hector is stronger than Echidna, but despite this his existence is unknown to future generations for some reason which no one knows.
Roughly 400 years ago, Hector pursued Echidna for unknown reasons, forcing her to flee to the Sanctuary located in the Kremaldy Forest. In order to prevent him from entering the Sanctuary, Echidna tried to create a magical barrier but failed, resulting in Hector successfully accessing the hiding place and facing off against Roswaal A Mathers, swiftly defeating him without breaking a sweat. Just before delivering the finishing blow, Echidna intercepted him, saving Roswaal's life. The Witch and the Warlock clashed, however, the outcome of the fight is unknown, though it's safe to assume Echidna survived the ordeal whilst Hector's fate is currently unknown.
Authority of Melancholy (憂鬱の権能 Yū'utsu no Ken'nō): Hector seems to be able to use the Authority of Melancholy.
- Hector seems to also be able to create force fields outside his reach by looking at a place or pointing his open palm towards it, as seen when he destroyed a hut in which Ryuzu was hiding, several tens of meters away from where Hector was standing.
- Like the other Witches of Sin (with the exception of Satella), Hector received his namesake from a celestial body. 624 Hektor is the name of the largest Jupiter trojan, an asteroid that shares the planet Jupiter's orbit around the Sun.
- According to the author, Hector is among the strongest characters in the series.
- Hector is the only male member of the Witches of Sin.
- The fact that Hector was unable to breach the barrier of the Sanctuary implies that he may've been a demi-human of some sort.
- "However, I have no heard a single thing of this Melancholy" Re:Zero Light Novel Volume 14: Chapter 2. Section 10
- "he had suffered unhealed wounds during the battle with that warlock, putting Roswaal's body into a state that made day-to-day life arduous" Re:Zero Light Novel Volume 15: Chapter 7. Section 2.
- "He looked toward the cabin Ryuzu was in-and without warning, it was crushed under the strain" Re:Zero Light Novel Volume 14: Chapter 2. Section 8
- "but Hector is in the top strength class in the story, after all" Season 2, Episode 20 Commentary
- "Of course, there are no confirmed Warlocks other than this Hector of "Melancholy" Season 2 Episode 20 Commentary