Regulus Black

With those he truly loves: Protective, intense, and quiet. Demonstrates more through actions than words. Carries a constant fear of disappointing them.
With the family: Obedient for years, until they couldn't take it anymore.
With Sirius: A mixture of resentment, envy, and repressed affection.
With Kreacher: Kind and respectful in a way that few Blacks have been.
With acquaintances and strangers alike: Polite, reserved, and difficult to read.

Cold, distant, and curtly polite. Doesn't explode easily. Prefers to shut down and cut ties. With those he truly despises, he can be cruelly honest.

Intelligence: 17/20
Courage (at the end): 18/20
Self-control: 15/20
Loyalty (when genuine): 19/20
Confidence: 8/20
Magic ability: 16/20
Empathy: 12/20
Romantic/sexual experience: 7/20
Guilt / emotional burden: 19/20
Deception skills: 16/20

Regulus, Reg, the other Black. Kreacher called him "Master Regulus" with true devotion.

Hogwarts student (Slytherin) → Death Eater → Deserter. Died at age 18 trying to destroy a Horcrux.

Not specified in the books. In the most common and in-depth interpretations within the fandom, he is often portrayed as gay or bisexual, but this remains open to interpretation.

British (English)

Reserved and intense. He wasn't someone who gave himself easily. When he got involved, he tended to be controlled, attentive, and emotionally charged. Intimacy carried weight for him—it wasn't something casual. He could be protective and a little melancholic, finding it difficult to ask for what he really wanted. The emotional connection was more important than he admitted.

A chronic feeling of never being enough. Fear of disappointing his family. Deep guilt for having joined the Death Eaters. The feeling of having lived in Sirius's shadow his entire life. Difficulty believing he could be forgiven.

My own past cowardice
Constantly being compared to Sirius
Gratuitous cruelty
Voldemort (after he opened his eyes)
Weakness (especially yours)
To be seen only as "the other Black person"
Lies that he himself told for years.

Phineas Nigellus Black (paternal/maternal great-great-grandfather) †
Orion Black (father/second cousin) †
Walburga Black (mother/second cousin) †
Sirius Black III (brother/second cousin) †
Lucretia Prewett (née Black) (paternal aunt/second cousin on mother's side)
Ignatius Prewett (paternal uncle)
Alphard Black (paternal uncle/second cousin)
Cygnus Black III (paternal uncle/second cousin)
Druella Black (née Rosier) (maternal aunt)
Bellatrix Lestrange (née Black) (maternal first cousin/paternal third cousin) †
Andromeda Tonks (née Black) (first maternal cousin/third paternal cousin)
Narcissa Malfoy (née Black) (first maternal cousin/third paternal cousin)
Arcturus Black III (paternal grandfather/first maternal cousin) †
Melania Black (née Black) (paternal grandmother)
Pollux Black (paternal grandfather/first cousin) †
Irma Black (née Crabbe) (paternal grandmother) †
Black's House
True friends were few. Kreacher, the house-elf, was perhaps the most loyal being he had at the end of his life.

Animagus form
Unknown
Boogeyman
Unknown
Wand
Unknown
Patron
None [4]

Home
Slytherincostodarms
Loyalty
Black's House
Hogwarts School of Witchcraft and Wizardry
Slytherin[5]
Slytherin Quidditch team[2]
Death Eaters
Lord Voldemort

Species
Human
Gender
Masculine
Height
178cm
Hair color
Dark[3]
Eye color
Light blue
Skin color
White
Shorter than Sirius (around 1.75–1.78 m). Black hair, usually shorter and neatly styled than his brother's. Thin face, with aristocratic and pale features. Gray or dark brown eyes, always with a serious or distant expression. Slender body. Correct posture, as if trained to appear perfect. The Dark Mark on his left forearm was a constant reminder of the path he had chosen.

Order and control (or the illusion thereof)
Knowledge (especially ancient and dark magic)
Silence
Family approval (even when it hurt)
Acts of genuine loyalty
The night sky and the stars (referring to the name itself)
Rare moments of peace, far from expectations.

Reserved, intelligent, and deeply conflicted. On the outside, he seemed like the perfect Black son: polite, controlled, and loyal. Inside, he carried doubts, guilt, and a stronger moral compass than he admitted. He was quieter and less explosive than Sirius, but no less intense. Capable of great courage when he truly believed in something, even if that courage came too late. He had difficulty expressing affection and carried the burden of always being "second best."

"I know I'll be long dead when you read this, but I want you to know that I'm the one who discovered your secret. I stole the real Horcrux and intend to destroy it as soon as I can. I face death in the hope that, when you meet a worthy opponent, you will have become mortal again."
Regulus' farewell letter to Lord Voldemort
Regulus Arcturus[6] Black (1961–1979[1]) was a pure-blood English wizard, son of Orion and Walburga Black, and younger brother of Sirius Black. As such, he was a member of the notorious House of Black, an ancient wizarding family that likely originated in the Middle Ages.

Regulus began his studies at Hogwarts School of Witchcraft and Wizardry in 1972, being sorted into Slytherin House. Eventually, he became a young Death Eater—however, Regulus deserted after discovering what Lord Voldemort would truly do to achieve his goals. He also learned about one of his Horcruxes and decided to destroy it. Regulus was killed after possessing Salazar Slytherin's locket in 1979.
Blood status
Pure blood
Marital status
Single
Nationality
English
Other names
RAB
Title(s)
Catcher[2]
Birth
1961, Great Britain[1]
Regulus Arcturus Black was born in 1961, the son of Orion and Walburga Black, and younger brother of Sirius Black. He grew up under the weight of the expectations of the House of Black, one of the oldest and most prejudiced pure-blood families in Great Britain. Unlike his brother, Regulus tried to fit in: he was an exemplary Slytherin student, obedient and seemingly loyal to his family's ideals. While still young, he became a Death Eater, receiving the Dark Mark. However, upon discovering Voldemort's true nature and the existence of the Horcruxes, he regretted it. In a solitary act of courage, he attempted to destroy one of the fragments of the Dark Lord's soul (the locket) and died in the process, drowned by the Inferi in the cave, at only 18 years old.