When preparing for their first mission, the Suicide Squad are given access to their personal belongings. Among the various weapons and custom outfits, there's also a pink unicorn plush toy that apparently belongs to Captain Boomerang and which he hides inside his jacket. He also drops it, likely by accident, during battle later on but then picks it up again and puts it back into his jacket.
I wonder what's the matter with this plush toy, though. Now of course it first of all seems to be an obvious comedic element (as is his entire character) when having this rugged guy care for such a cutesie little pinky plushy, possibly also adding to his crazy character. But given I'm not the biggest expert on DC comics, let alone Captain Boomerang, I might as well be missing some reference here, either to his comics origins or other possibly out-of-universe matters.
So was this just random throwaway craziness or is the inclined expert on the Suicide Squad, it's film's production, or pop-culture in general, able to gain more out of that little unicorn's appearance?