Season 2 of Batwoman saw the debut of a brand new hero beneath the cowl. Ryan Wilder is relatively new to the DC Universe, but she's already making an impact in both the comics and on the small screen. The character is continuing to evolve very quickly and fans are already talking about potential team-ups.
A hero in the DC Universe can often be defined or developed further through their relationships with other vigilantes. Fans saw more out of Barry Allen thanks to his friendship with Supergirl and his student relationship with Green Arrow. The Arrowverse's Clark Kent wasn't wholly fulfilled until he came face to face with a Superman from another reality. There's a number of great interactions for Ryan Wilder to have that would be both fun and continue to push the character further.
The League Of Heroes
The last time audiences saw Thea Queen or Nyssa al Ghul, they took the League of Assassins and turned them into the League of Heroes. This plot point was never developed further, with the fate of the new League unknown.
Ryan Wilder's team-up with this new League could be very compelling. The Bat Family of course has a long history with the Ghuls, which would cause a lot of conflict in itself. Linked to the legacy of another vigilante in Speedy, and Ryan Wilder could certainly learn a lot about protecting the streets and creating a name in the hero community.
Batman
There's a lot of talk as to whether Robert Pattison's take on the Batman will be a part of the DCEU or not. Regardless, the character will certainly reside in the larger Multiverse and fans have already seen that anything can happen.
Admittedly it would be unlikely to see Pattison guest star in the Arrowverse, but then again Ezra Miller has already made an appearance as the Flash.
Supergirl
The previous Batwoman, Kate Kane, had built up a powerful friendship with Supergirl. The Arrowverse's version of the World's Finest, it would be a shame to lose that dynamic. In fact, Kara could teach Ryan a lot about her predecessor.
With Supergirl coming to an end, the crossover fans hope for might not happen in the way they expect. But down the line, there's always a chance of Supergirl returning to the CW once again to guest star in Batwoman.
The Titans
The Titans have found a home on a completely different Earth, but they have already been shown to be a part of the much larger DC Multiverse. There's always a possibility that these two Gotham-based shows could crossover.
With the Titans heading back to the city of the Dark Knight in the next season and potentially playing off of old Batman stories, there's a lot of common ground to explore. What's more, characters like Dick Grayson and Jason Todd could show Wilder the result of living in the shadow of a member of the Bat Family. Bruce Wayne for them and Kate Kane for Ryan.
Constantine
John Constantine might be a user of dark magic and a master of the mystic arts, but he's also a deeply flawed hero who has managed to find a home with the Legends. Outside of this though, he has acted as a magical guide for many other heroes in the Arrowverse (and probably in Keanu Reeves' universe as well).
Oliver Queen has enlisted his services many times and no doubt the Caped Crusader did the same when he was around. When Ryan Wilder finally comes across her own supernatural threats, John Constantine might be the rugged dark detective that could open up a brand new world to Batwoman.
Sister Night
Sister Night stands for a lot of things. Racial justice, moral decency, and the pursuit of knowledge no matter how dangerous that may be. The character has served on the police force, become a vigilante, and opened up a lethal investigation to get to the truth.
Now potentially wielding the powers of Doctor Manhattan, it may be possible for Angela Abar to travel between Earths. As one of the best original characters from HBO's Watchmen, there are some intriguing parallels here when it comes to creating a character on screen who has little to no comic book origin or history. The ideologies of these two powerful women could certainly be contrasted in a compelling way.
Batgirl
There have been a lot of really fun cameos of heroes from DC's past across the Arrowverse, from the original 1960s Robin, to the Birds of Prey who once had their own TV show! Batgirl would certainly make for an unforgettable appearance.
Debuting in Batman and Robin, the movie has been absolutely trashed by fans and critics alike. Bringing back Barbara Wilson for Batwoman would spark an interesting set of comparisons, as this experienced Batgirl perhaps teaches Batwoman not to make the same mistakes that she did.
The Legends
The Legends are a complete group of misfits. This dysfunctional family has certainly grown together, despite being thrown in the deep end amongst a group of people they barely knew. Ryan Wilder is in much a similar situation now.
Almost picking up Kate Kane's life, she's in a completely different world but is already starting to form a dysfunctional family of her own. The Legends can teach Wilder a lot about self-confidence in her role and perhaps prepare her for some of the wackier problems she'll come across in her career.
Green Arrow
Mia Smoak offered fans some tremendous moments throughout her time on Arrow. It was a passing of the torch within the Arrowverse for Oliver Queen to give the seal of approval to new heroes.
With Queen now dead there's a new Green Arrow on the scene; one who's also just finding her footing in her own vigilante career. With her potential spin-off show canceled, Smoak is looking for a new role in the Arrowverse. She may just serve as a perfect long-term partner to Wilder.
Harley Quinn
Harley Quinn is an agent of chaos. Ryan Wilder might need someone like that in her life to completely test her. With no sign of Harley Quinn on Batwoman's Earth and the Joker supposedly gone, this would be an exciting relationship to explore.
Margot Robbie's appearance in the Arrowverse is perhaps even less likely than that of Robert Pattinson's. The dynamic between Harley and Wilder would be absolutely fascinating though, as Wilder struggles with the lines that she will and will not cross for justice.