

Babylon 5 has two women start a relationship… sort of.
They set up a frienship that was supposed to turn into a romantic relationship, but one of them left the show, cutting that subplot short. They still try to work it in, as the last couple episodes before the character exit heavily imply they are romantically/sexually involved, but nothing is explicitly confirmed until the next season when the remaining character briefly opens up about having loved the now absent character.
It’s not much, but it’s still pretty big for the early to mid 90s.
And it’s even more complicated by the fact that Talia was already the replacement for Lyta. And that the revelation about her being a sleeper was never meant to happen unless she left. Oddly enough, that exit was actually recycling the plan for Takashima had she made it past the pilot, only she got replaced… by Susan.
Plus there’s Garibaldi. His interest in Talia mirrors Zach’s interest in Lyta. Garibaldi’s interest is never resolved because of Talia’s exit. That they tried to reestablish that idea with Zach and Lyta implies there was a plan. Given where things go with Garibaldi and telepaths (including Lyta) that might have been very interesting.
Instead, Zach’s interest gets folded into the Byron plot. But Byron is also a late addition caused by the whole cancelation and uncancelation around season 5. If they hadn’t lost multiple cast members and rushed key plotlines to fit them into season 4, things would have probably been very different.