Each member of Task Force X in Suicide Squad has a colorful history, and a few quirks. Katana (Karen Fukuhara) has conversations with her sword, since it holds the trapped soul of her murdered husband. Deadshot (Will Smith) has his lucky mask. Harley Quinn (Margot Robbie) enjoys a nice shot of espresso. And Captain Boomerang (Jai Courtney) carries round a toy unicorn called Pinky which, going by the character notes that list him as having a fetish for pink unicorns, has probably been through some unspeakable things.
Speaking to Empire, Suicide Squad director David Ayer revealed that Pinky was a late addition to the cast, originally only intended to be a bit of set decoration for the scenes in the John F. Ostrander Federal Building. "I thought [Boomerang] needed a little something kind of fun and silly," the director explained. "And it kept appearing throughout the film. It became a bit of a mascot."
Though Pinky is not explicitly a character from the children's TV show My Little Pony (which does feature a pony called Pinkie Pie and a pink unicorn called Sugar Belle), Ayer confirmed that Digger Harkness is a fan of the show - a "Brony," as adult male MLP fans are affectionately nicknamed. "Yes, [he’s a] Brony," the director said. "Which is fine. I think it’s a good thing and gives him a little hobby besides robbing banks."
Some moviegoers have suggested that Captain Boomerang's love of pink unicorns is a rip-off of Deadpool, which also features an anti-hero who owns and has an intimate relationship with a toy unicorn (though Deadpool's is white with a rainbow-colored horn). However, unless all of Pinky's scenes were added during Suicide Squad's reshoots, the characters' shared interest is probably just a coincidence.
At one point in the movie, members of Task Force X have visions of seeing their ultimate desires fulfilled, but Boomerang's is not shown. Given his affection for Pinky, some might assume that his fantasy was cut because it didn't fit with the movie's PG-13 rating, but according to Ayer it would have just been a standard desert island fantasy - possibly involving the character being surrounded by bunny rabbits. Apparently Digger Harkness is a simple man with simple dreams.
Suicide Squad is in theaters now. Wonder Woman opens on June 2, 2017; Justice League on November 17, 2017; Aquaman on July 27, 2018; an untitled DC Film on October 5, 2018; Shazam on April 5, 2019; Justice League 2 on June 14, 2019; an untitled DC film on November 1, 2019; Cyborg on April 3, 2020; and Green Lantern Corps on July 24, 2020. The Flash and Batman solo movie are currently without release dates.