- Crowning Moment of Heartwarming: In Twin Knights, after Franz, Sapphire, and Violetta have been locked in the tower by usurpers and Franz has been separated from his family, Violetta breaks down crying over what's happened. Sapphire calms her down, telling her, "You can't give in to bad people, even if things are tough". She then gets a sword off the wall and proceeds to train her daughter to improve her fencing.
- Fair for Its Day: The iffy gender politics are somewhat excused by the fact that it was written in The Fifties. There's a definite pro-gender equality message in the story, but for modern viewers/readers it can be easy to not notice that because of all the characters going on about how men are inherently stronger than women.
- Hilarious in Hindsight/Harsher in Hindsight: Whichever this manga exemplifies is up to you, but the possibility of a man's soul being within a woman's body and vice versa brings many current issues involving the LGBT community to mind.
- Older Than They Think: Sapphire having both a boy's heart and a girl's heart is reminiscent of Two-Spirit people.
- Values Dissonance: Someone in the 2000s would disagree with a lot in this show, because it was made in the 1950s.
- Viewer Gender Confusion: Sapphire for one.