"Arrow" season four is finally coming on Wednesday, but before that, IGN had a chance to sit down with co-showrunner Wendy Mericle for an interview. Here are five thrilling things that Mericle revealed about the forthcoming season.

1. "Arrow" to Green Arrow

Mericle said that fans would see a different Oliver Queen, played by Stephen Amell, this season. The happiness, lightness and his new-found faith in humanity — not to mention his relationship with Felicity — will affect how he approaches his missions in season four.

The show and characters are going to be the same, but the creators placed a different color on Oliver's character, showing a different side of him. Fans have grown accustomed to Oliver being a straightforward kind of guy, but in the new season, there's going to be a bit of humor in his character.

Oliver, as the Green Arrow, will be wearing a sleeveless, slightly lighter green costume.

2. The Villains

Explaining the difference of Damien Darhk and Malcolm Merlyn, Mericle said that Darhk did not possess the vulnerability of Merlyn, who had suffered a loss.

"He is absolutely dedicated to his mission," she said explaining McDonough's character. "We really wanted to explore someone who is a bona fide sociopath and he has a god complex and Neal brings this kind of very interesting grounded energy but he has those eyes that when he wants to be a badass, it's like he could kill you with a look."

A new villain will be joining Darhk in the person of Anarky. According to the Movie Pilot, the version that fans will be seeing in "Arrow" season four will be Lonnie Machin, who was his first iteration.

3. Constantine

He will be appearing on the show, OuterPlaces reported. Marc Guggenheim's co-showrunner revealed that it was born of Sara Lance's storyline because they needed someone to bring her back.

"He is coming in fully as who he was on the show," Mericle revealed. "It's so cool to have that cross-pollination, and DC was very generous letting us have him."

Part of this character coming into the show is the exploration of magic and mysticism. She said that "Arrow" started very grounded — no magic, meta-humans, superpowers.

"The Flash" was featured in season two, along with the meta humans. In season three, the universe of the League of Assassins was explored.

"Now we get to go and skirt some bigger questions that are more about -- not necessarily religious but morality questions and questions of faith," she said.