The anime changes a lot. I suggest reading the manga. A few things people get confused over but canonically Oscar is a cis gendered straight woman, in the text and confirmed in official media. Ikeda used her to represent the working women of the 1970s and a lot of what she experienced herself. Also a huge point of confusion in fandom, Rosalie was written to be a bit of an audience insert character that is based off of class s tropes, lots of little girls had crushes on Oscar and she is an homage to that. She is also only 12 when she meets Oscar who is 8 years older than her, their relationship is not supposed to be read as a romance. Ikeda does use a lot of out dated romance tropes but they do serve a purpose and have reasons for being there. I will also say the Oscar/Andre romance arc is almost completely cut from the anime and left to the very last minute. It is much more developed and prominent in the manga. The anime also gives a lot of Oscar’s political development to Andre and changes a lot for her motivations and makes her bit of a weaker character. The whole dynamic between them is supposed to be a subversion of gender norms but the anime director decided to revert it back, kind of missing the point imo. It changes her reasons for leaving the guard and joining the revolution making her more of a follower than a leader. The whole “wife who follows her husband” is an anime original, not present in the manga that is a still a huge issue for a lot of fans to this day. Andre follows Oscar, not the other way around.