In 2012, The CW aired Arrow. A TV show based off of DC Comics' Green Arrow. In 2014, a spin-off of Arrow was made called The Flash. But now that universe has gotten bigger, and may get bigger. So I am giving you the list of the official Arrowverse (I refuse to call it the Flarrowverse because it sounds stupid), and the TV shows that can possibly be in the Arrowverse.
The Official Arrowverse:
The series that started it all. Arrow is about Oliver Queen, who came back to Starling City after being stranded on an island for five years. He came back and tried to avenge his father and his death. But eventually he realized that his city needed saving, so he created a team of heroes, and they protect the city they live in. This series has proven to be a fan-favorite, and has one of the most interesting stories on television, at least in my opinion.
Barry Allen first appeared in Arrow's second season, in two episodes. Then they gave him his own spin-off. The spin-off titled The Flash is about Barry Allen and his team, trying to protect Central City from all of the Metahumans that the particle-accelerator created. The show is amazing, and many love it. The stories they tell are very interesting, and have deep complexity to them, and the effects the show can pull off, are absolutely stunning.
Constantine follows John Constantine, Zed Martin, and John's old friend Chas, as they go around the world, protecting innocents from threats that break through to Earth, caused by the Rising Darkness. The show was not originally apart of the Arrowverse, but when Stephen Amell (Green Arrow/Oliver Queen) expressed his interest in crossing over Arrow with the cancelled series, the idea was eventually used in season 4 when Constantine helped to restore the soul of Sara Lance. The show was only thirteen episodes, but was very good, and was cancelled way too early. The legends of Constantine lives on, and he may return. He is rumored to appear as a main cast member of Legends of Tomorrow season 2.
The animated series Vixen follows Mari McCabe, who gains powers from the Tantu Totem she wears making her able to use the power of any animal, as she stops threats as Vixen. In my opinion, the show was okay, but was very short, and did not provide much story. If you put the six episodes together you get maybe one half-hour of footage. The show was still good, and was a different, interesting take on superheroes in the Arrowverse.
Legends of Tomorrow
Rip Hunter travels back in time to the present day to gather a team to stop Vandal Savage, a 6,000-year-old immortal trying to destroy the world and time itself. The series' first episode will air on January 21, 2016, and many people are very excited about the show. Legends brings together many heroes and villains from Arrow and The Flash, and introduces new characters. The show is very different, as it is not an origin story for one hero.
Those five series' make up the official Arrowverse. It all started with Arrow, and the next step is Legends of Tomorrow.
Supergirl is about Kara Danvers, a Kryptonian in hiding on Earth. When she is 24-years-old she embraces her powers and becomes Supergirl. As Supergirl she fights crime all around National City, protecting the innocents of the city. Greg Berlanti, one of the creators, writers, and executive producers, has stated his interest in crossing over this show with the Arrowverse. And recently, a rumor popped up that the show might crossover with The Flash, which would make the show canon within the Arrowverse. This is the series most likely to crossover, as it has the same team, and the same style as The Flash.
Gotham is a prequel to the story of Batman. The series' main focus is the detective Jim Gordon and his partner Harvey Bullock, solving crimes around the city. Another story in the series follows Bruce Wayne, who is trying to find out who killed his parents. The show is weird, because we do not when it is set. The show could be set in the 1990's, the present day, or even the future. But the most likely option is the past, which would make the series a prequel to Arrow. But this show is alone, and shouldn't be. The way I would crossover this series with the Arrowverse, is to get Colin Salmon to appear on the show as Walter Steele, who is a recurring character on Arrow. Steele would be in Gotham on a business trip of some sort, making this show canon with Arrow and others.
iZombie is about Liv Moore, a zombie who took a job at the King County Morgue in order to get brains to eat. When she eats the brains, she inherits some of their personality traits, which give them clues to the crimes to solve. (The show is much better than it sounds). The show is actually on The CW, which is the same channel that airs The Flash and Arrow. But the main reason I think it can go in the Arrowverse, is the references to Batman and Superman. In the pilot episode, Superman is referenced, but it is said so vaguely you can't tell if he is real or a comic book character. Batman is referenced twice, but is on the same boat. It is unknown if he exists in this universe as a real person or a comic book character. Superman exists on Supergirl, and Batman exists in the Arrowverse. Since I already out Supergirl with The Flash and others, iZombie would fit perfectly.
Blindspot is about Jane Doe, who wakes up with tattoo's all over her body and no memory. The FBI take her in, and find out that every tattoo has a clue to each crime they must solve. I have not had the time to watch the show yet, but I want to, because I know it is good. My main reason for the show existing in the Arrowverse, is that Greg Berlanti is an executive producer. But the show is based off a story in DC Comics. This one is slim, but possible.
This is a series that has had no news since the announcement of the series, making this very likely to be cancelled. But if the show happens, then it will follow Virgil Hawkins, who was exposed to an experimental chemical while he was caught up in a gang war. The chemical gave him many electromagnetic powers, which he eventually started using for good. I would want this series to not be alone, and as Stephen Amell once said, "Any DC TV show can crossover."
The only news about this series has been the characters. If the show happens, which is unlikely, the team will consist of Robin, Oracle, Raven, Starfire, and Hawk & Dove. The show would follow the team as they fought crime throughout the season. But if this series happens, the best thing they could do is to cross it over with the Arrowverse. The the easiest ways would be to have Colton Haynes return as Roy Harper, or have Manu Bennett be the villain, Deathstoke. This one along with Static Shock are just wishful thinking, but it would be the best option to have all of these DC TV shows crossover.
Extra: The Dark Knight Trilogy
This is not a series, but is a trilogy of movies. The trilogy was about Bruce Wayne, who became Batman and protected Gotham City from the crime and its many villains like Scarecrow, the Joker, and Bane. Arrow has a similar style to this trilogy, as it is dark, gritty, and realistic. I already put this trilogy with the Arrowverse because it fits in perfectly. The order would go like this: Batman Begins, The Dark Knight, Arrow season 1, The Dark Knight Rises, then Arrow season 2, and the Arrowverse would continue with its other shows. The best way to crossover this trilogy with Arrow, is to have Cillian Murphy return as the Scarecrow on Arrow.
These are my best options to crossover with the Arrowverse. Many of them fit in their own ways, but they can't really fit altogether at once.
Do you like any of my ideas? Do you want any of these shows to crossover with the Arrowverse? Do you like where the Arrowverse is headed? Please, let me know!