I actually thought the character of Fish was pretty cool, it was just her storyline in the show that went downhill over the course of the season.
I wonder if the expansion from 16 episodes to 22 is one of the reasons for that. Her final arc with that crazy plastic surgeon seemed like it was put in there to give her something to do while they delayed her confrontation with Penguin for the season finale.
I believe the producers have confirmed that this was actually the case. Although it's stupid, because her final confrontation was so rushed that it could've benefited enormously from expansion. How did she build that new mob of street people? How did she recruit Selina? They could've easily spent six episodes developing that instead of wasting time with the Dollmaker. The effective part, about Fish using a mix of benevolence and ruthlessness to win over a "family," would've plugged into that just as well, and would've been far more meaningful because it would've actually had a payoff. And her final confrontation with the Penguin could've been expanded too, so that Oswald actually did something to earn his victory rather than just lucking into it because the writers knew he was supposed to win.
^ I think we'll eventually be able to add Supergirl to that list, but, yes, that's the full "Flarrow"-verse continuity as it currently stands.
God, that word "Flarrow" is like chalk on a blackboard to me. Any chance I can persuade you to switch to "Berlantiverse?" One of the producers (either Guggenheim or Kreisberg, I think) called it that on a Comic-Con panel, so I take it as the official name for the continuity. It's not ideal, but if it's official, then I'm going with it.
As far as the Wikia wikis go, the Arrow/Flash one has already added an article for Constantine and mentions the series on the home page.
I suppose there'd be no point in combining the wikis if there's only one episode's worth of crossover. Probably makes more sense just to have links to the
Constantine wiki where relevant.
DC shows seem to have a bit of an intermittent tradition of retroactively folding separate shows into their universe. I may have already mentioned
Static Shock -- in the first season, it was a standalone show, with the characters talking about Superman/Clark Kent as a fictional character, but its second-season premiere featured the DC Animated Universe versions of Batman and the Joker, and it continued to have crossovers with the other DCAU shows over the years to come. I suppose you could also count the '60s
Batman giving the Green Hornet and Kato a guest appearance after previously treating them as fictional. Although the Green Hornet has never been a DC character.
And then there's the fact that
Super Friends and
Scooby-Doo apparently inhabit the same universe...