Sirius Black, nicknamed Padfoot, is the last heir of the House of Black, a once notable pure-blood Wizarding family. Sirius's early life proved unhappy; he had come to hate most of his relatives, in particular his mother. He rejected his family's pure-blood elitism and reverence for the Dark Arts. In contrast to his home life, Sirius greatly enjoys life at Hogwarts, where he is inseparable from his best friends: James Potter, Remus Lupin and Peter Pettigrew. Sirius leaves home at the age of sixteen and takes refuge with James and his parents. His outraged mother burns his name off the family tree. He is left financially independent by his Uncle Alphard's generous bequest. After leaving school, he remained close friends with James and eventually attended James and Lily's wedding as best man. When their son, Harry, was born, the Potters name Sirius Harry's godfather. When James and Lily are killed by Voldemort while protecting their child, Sirius tracks Pettigrew down because the latter betrayed the Potters to Voldemort. However, Pettigrew manages to fake his own death, but not before killing twelve Muggles and framing Sirius for betraying the Potters. Sirius is then arrested because of Pettigrew's crimes, and spends the next years in Azkaban. Sirius states that unlike most other Azkaban prisoners, who often became insane during their terms of imprisonment, he was able to keep his sanity because he knew he was innocent. He was able to transform into his Animagus dog form, knowing that the dementors lack the ability to perceive unsophisticated canine feelings.
Twelve years later, Sirius sees a picture of the Weasley family on the front cover of the Daily Prophet, in which a rat stands perched on Ron's shoulder; Sirius immediately recognises Pettigrew in his Animagus form. This knowledge clears his mind and he becomes the first person known to have escaped Azkaban, accomplishing this feat by transforming into his Animagus form: his severe weight loss from malnutrition allowed him to slip through his cell bars. After his escape, Sirius takes refuge in and around Hogsmeade. Knowing that the dementors are stationed around Hogsmeade and at Hogwarts, Sirius remains in his Animagus form during this time, and is able to enter the Hogwarts grounds without being recognised by the dementors. Towards the end of Prisoner of Azkaban, Harry, Ron, and Hermione confront Sirius and Harry attempts to kills him; however, Lupin's timely intervention prevents Harry from doing this. Lupin, who has learned that Sirius is innocent, is reunited in friendship with him. Pettigrew is unmasked, and Harry begins to view Sirius as a surrogate father, although events swiftly turn against him again – Pettigrew escapes, and Sirius is captured by the Dementors at Hogwarts and sentenced to the "Dementor's Kiss". Harry and Hermione help him escape with Buckbeak, a hippogriff who had also been unjustly condemned.
In Harry Potter and the Goblet of Fire, Sirius has little influence; his return cannot prevent the disaster at the Triwizard Tournament and he mostly gives Harry advice on how to complete the Triwizard Tasks. In Harry Potter and the Order of the Phoenix, Sirius takes refuge in his ancient family home at 12, Grimmauld Place, which he allows to be used as the Order headquarters. His confinement causes depression, and he is frequently withdrawn and antagonistic. The hostility between himself and Kreacher, his demented house-elf, also affects him. When he briefly leaves the house to see Harry off to Hogwarts, his Animagus form is recognised by Draco and Lucius Malfoy, resulting in more threats and warnings. Near the middle of the novel, a large number of Death Eaters, including Sirius's hated cousin Bellatrix Lestrange, break out of Azkaban. The Ministry, which refuses to accept that Voldemort has returned and that the dementors have joined him, tries to place the blame on Sirius, stating that Sirius helped the prisoners escape and is leading them. Sirius acts as a brother figure to Harry throughout the book but, according to Rowling, "what Harry craves is a father."[4] Sirius encourages Harry to oppose Dolores Umbridge and her reforms, and strongly approves of Harry starting the secret defensive tutorial group for students, Dumbledore's Army. He also demonstrates a high-level of trust in and respect for Harry, willingly answering the latter's questions about the Order and Voldemort.
With his growing power, Voldemort implants a false vision into Harry's mind that Sirius is captive and under torture at the Department of Mysteries. Convinced that Voldemort is torturing Sirius, Harry and his friends gain access to the Department of Mysteries. When they are ambushed by Death Eaters, Harry realises that Voldemort haslured him into a trap. Snape, however, alerts the Order that the students have gone to the Ministry after confirming that Sirius is safe at Grimmauld Place. Several Order members arrive at the Ministry, Sirius among them, and battle the Death Eaters in the "Death Chamber." During a frenzied duel with Bellatrix, Sirius taunts her for failing to harm him. Bellatrix strikes Sirius with a curse, sending him backwards into the veil, causing his death.
Sirius was portrayed by Gary Oldman in the film adaptations of Prisoner of Azkaban,Goblet of Fire and Order of the Phoenix. Sirius as a teenager also made a brief appearance in Order of the Phoenix, and was played by James Walters.
昨天看完了凤凰社，小天狼星消失的时候非常难过，失去了他就失去了对整个小说的兴趣。这个在小说中很迷人的人物，是个十足的“极品男人”。Gary Oldman仍然如《惊情四百年》的Dracula一样惨白清瘦、面容抑郁、眼神萧索，让人隐隐心痛，他也是Sirius的不二人选：
优点：聪明，机智，勇敢（热爱冒险），爱憎分明，非常具有正义感和责 任心，坚强，忠诚义气，善良，细心，幽默，优雅贵族气质，英俊（主要是指进阿兹卡班以前，不过现在的Sirius也不错，很有男人味）
缺点：傲慢（太自信，轻敌），不够冷静，缺乏自制力，情绪化，做事不考虑后果，脾气暴躁
其他：好恶作剧，不羁，不拘小节，玩世不恭，忧郁，孤独
除了冷静的欠缺和脾气太坏这两点之外，Sirius基本上具有一个极品男人所应拥有的一切品质（至于其他的某些可以理解为男人不坏，女人不爱），此外，他还有让现代则偶女性频频侧目的经济条件，像是银行有存款（古灵阁711号金库，含金量高，不仅有他叔叔留给他的钱还应有他父母的遗产，想他买火弩箭那么大方，真是款爷），有房（格里莫广场12号，面积大，地段好，年代久远，含大量古董，考古价值极高，少说也值个几千万英镑），有车（巨型飞行摩托车，虽然不比什么法拉利，保时捷，但在吸引眼球方面绝对更甚--尤其是麻瓜的眼球），简直一个活脱脱的钻石王老五，可是他的一生都充满了坎坷和不幸，童年10年压抑的家庭生活，好容易16岁摆脱，但离他21岁被陷害进阿兹卡班只有短短也许也是他这一辈子最快乐的5年，挣扎在阿兹卡班12年的忏悔，之后是为了追凶，历经艰辛奔波逃命还不忘照顾他的教子，仅仅36岁就。。。（5555555555），而且至死都没有洗托罪名，真是红颜薄命啊（昏~~~~~）
英文名：Sirius Black
生日：10月31日
年龄：死时年仅36岁。
学院：格兰芬多学院（大约 1971－1978）
特征：在阿兹卡班12年拘禁生活带走了小天狼星英俊的面庞和健康的身体。他很清瘦，看上去就像个鬼，依旧是黑发和黑色的眼睛。他还是个没注册的阿尼马格斯，只要他愿意就能变成一只大黑狗。
血统：纯血
家族：纯血主义的布莱克家族长子。其弟雷古勒斯·布莱克，是一名后来醒悟的食死徒。他和克利切偷走了伏地魔的挂坠盒，并把挂坠盒交给了克利切，希望克利切能毁掉。由于喝了岩洞里的魔药（和邓布利多喝的一样，但邓布利多被哈利救了），被阴尸拖入水后死亡。（死圣第4章）
与哈利的关系：是哈利·詹姆·波特的教父。（囚徒第11章）
绰号：大脚板（阿尼马格斯形态之后）Padfoot
眼睛：灰色（罗琳官方网站）（他的眼睛被描写为深邃，囚徒第19章）
发色：黑色（高兴时就变短，不高兴时就变长）
牙齿：米黄（囚徒第17章）
身材：高大（囚徒第17章、凤凰社第24章），但自从进入阿兹卡班后变得很单薄（火焰杯第27章）
外貌特征：非常英俊——稍有些布莱克家族的傲慢——当他吃饱了的时候。但后来进入阿兹卡班之后就日益憔悴（火焰杯第27章）；笑声很大
专长：阿尼马格斯（变成一只巨大的黑毛犬）
首次提及：《哈利·波特与魔法石》第一章
首次出场：《哈利·波特与阿兹卡班的囚徒》