If we take the Bechdel Test, all splatoon game and dlc pass the test:
Splatoon 1 : The squid sisters broadcast
Splatoon 2 : Off the hook broadcast
Octo expansion : Pearl and Marina regulary exchange.
Splatoon 3 : Squid sister in the story mode are the first to talk together between woman, if you don't count the deep cut broadcast because Big Man is in the conversation.
However, the other ways around (about man representation) The test can fail :
Splatoon 1: Cuttlefish and octavio talk to each others, and talk to agent 3 if you choose a boy.
Splatoon 2: If you choose a girl has agent 4, I believe cuttlefish and octavio don't talk to each other directly, and so the test failed.
Octo expansion: Once again, if you take a woman for agent 8, the only man during the story will be cuttlefish tho, failing the test.
Splatoon 3: Cuttlefish and Mr. Grizz talk during story mode. If neo agent 3 is a boy, big man talk to him.
Having a game that maily have female character is fascinating when you look at the interaction on the other side too.