In the most recent trailer for Zack Snyder's upcoming film Justice League, after seeing Batman alongside Aquaman and Wonder Woman, JK Simmons' Commissionet Gordon notes, “It's good to see you playing well with others again." We can only assume that's a reference to the deceased Robin hinted at in Batman v Superman: Dawn of Justice, but it's a fun line leveled at a character who is widely known as an introverted loner with a singular obsession. In other words, its hard being friends with Batman (as the Lego Batman film hilariously illustrated).

Be that as it may, Batman does have friends. And more than you would think from such an elusive character. They just have to be very patient and accepting of his infamous prickly, untrusting demeanor. It's not easy earning Batman's trust, but once you do, there's no one else you'd rather have in your corner.

We know all the mainstays: Gordon, Alfred, Nightwing, Tim Drake, and fair-weather friends like Catwoman and Talia Al Ghul. But there are many other close associates of Batman you might not be aware of.

So take a look at our list of other superheroes you didn't know Batman was best friends with to shine a light on his inner circle.

15 Green Arrow

Green Arrow and Batman have more in common than most superheroes in the DCU. They're both orphan billionaires. They both use their immense wealth to fund their vigilante activities. And they're also both heroes who aren't blessed with superpowers, and instead must rely on their physical prowess and trusty gadgets to fight crime. So it's not too surprising that Oliver Queen and Bruce Wayne have joined forces over the years, both during missions with the Justice League and otherwise.

Green Arrow and Batman compliment each other in many ways, perhaps most famously captured in Frank  Miller's classic 1986 miniseries The Dark Knight Returns, where Batman enlists Arrow's services to help take down Superman using an arrow laced with kryptonite. In Miller's 2001 sequel The Dark Knight Strikes Again, they again join forces, this time to stop the evil reign of Lex Luthor. A straight-shooter like Green Arrow makes for the perfect pairing with the Dark Knight.

14 The Creeper

Occasionally, Batman is joined in his Gotham City crime fighting exploits by The Creeper, a bizarre superhero who is secretly local news reporter Jack Ryder. The duo first joined forces in The Brave and The Bold issue #80, and The Creeper has fought alongside the Dark Knight on numerous occasions, both one-on-one, and in the Justice League. He also joined Batman's other superhero team The Outsiders to help him ward off the villain Hush.

The Creeper's unique skill set, including the power to heal from any injury and enhanced strength and agility, compliments Batman's own abilities, as has been demonstrated in storylines including Hush, Flashpoint, and Kingdom Come. They've also appeared together in animated form in The Brave and the Bold and The New Batman Adventures.

The Creeper may not be a household name in the DCU, but he's proved to be an indispensable ally of the Caped Crusader.