Blackinnon

"Marlene McKinnon. She was killed two weeks after this was taken. Voldemort wiped out her entire family."

- Sirius Black

Blackinnon is the Het ship between Sirius Black and Marlene McKinnon from the Harry Potter fandom.

Canon
Sirius Black and Marlene McKinnon is a member of the original Order of the Phoenix.

On the movie version of Order of the Phoenix, Sirius shows Harry a photograph of the original member of the Order.

The first person Sirius mentioned, before James and the others, was Marlene McKinnon.

In the last book, Sirius Black receives a letter from Lily Potter (nee Evans) and it mentioned Marlene Mckinnon's passing, which proves that they are indeed friends.

Marlene McKinnon came from a powerful wizarding family, as Hagrid mentioned, "No one ever lived after he decided ter kill 'em... he'd killed some o' the best witches an' wizards of the age — the McKinnons, the Bones, the Prewetts —"

This makes people believe that she is a pure-blood, which gives her a similarity to Sirius Black.

Fanon
It is often shown that Marlene McKinnon was in the same year and house as Sirius Black. Which makes Marlene a friend to Lily Potter. It is also shown quite often that Marlene and Sirius had the same personality. reckless and arrogant,

Marlene is described as a tall girl with curly blonde hair. And just like Sirius, she had a lot of admirers during her time at Hogwarts.

Fandom
FAN FICTION

Sirius/Marlene on Fanfiction.net

Sirius/Marlene on Archive of our Own

WIKI

Marlene McKinnon on WikiBooks

Marlene McKinnon on Harry Potter Wiki

TUMBLR

Blackinnon tags on Tumblr

Marlene McKinnon tags on Tumblr