Blaise Zabini is a fictional character mentioned in passing in the novel Harry Potter and the Philosopher's Stone. Not many details of the character are given, and even the gender is unknown: the only things that are known are that the character is Slytherin and the same year as Harry Potter.

Fanfiction fan types endlessly speculate about this character and write different fanfiction stories which depict the character as either a girl or a boy to fit their personal preferences. Most Harry Potter Lexicon fan types concluded, long ago, that this character was of no importance. However, they have recently speculated that this character may be the Slytherin boy who could see Thestrals in Harry Potter and the Order of the Phoenix.

The Harry Potter Lexicon has concluded that this charactor is male. As the name is male(though they admit there are exceptions) and the Spanish translation uses the masculine verb. If this is true, then Blaise Zabini has to be the Slytherin boy who could see Thestrals, unless there are more than five Slytherin boys in Harry's year, meaning that the fanfiction-wrting fans may have been right along in thinking this charactor is of some importance.