He’s similar to Mamoru in that he’s put in the position female characters are typically put in in narratives- not just as a damsel in distress our awesome lady hero saves, but in that he mostly exists as a cypher to motivate other characters so so most don’t seem to really get attached to him as a person as much as they do the other characters.
Like, you care about him because of what he means to Ahiru, Fakir and Rue (someone who’s a good person who comforted them in their time of need and therefore someone they love and must save). He exists to motivate other characters, and if something bad happens to him, it’s less “Poor Mytho!” but instead “Poor Ahiru! Poor Fakir! Poor Rue! You guys gotta get him back so you can be happy” because he is a mostly a prop in their narrative.
So yeah he’s basically the role the woman often takes, except he is a man who exists to prop up the narrative of two women and Fakir, the characters who tend to actually drive the narrative.
Plot: Ahiru (or Duck) is, well, an actual duck who wished to be a human girl when she fell in love with the lonely and handsome Mytho who danced by her lake. She was granted her wish by the mysterious Drosselymeyer, and given the power to transform into Princess Tutu, a magical girl who saves the day through dance. It turns out Mytho was an actual prince who had escaped from within his story when the author died, and sacrificed his heart to seal away his enemy. It is up to Princess Tutu to save Mytho by gathering the shards of his heart and restoring it. Her obstacles include Mytho’s controlling friend Fakir and closed-off girlfriend Rue, neither of whom think it is right for Mytho to regain his emotions.
Princess Tutu should be noted for it’s massive character development and dark deconstruction of fairy tales. It heavily incorportates both literary themes and themes of classic ballet into its storyline and the characters often act out their conflicts through ballet dancing. It deconstructs the nature of storytelling itself.
Women and Gender: Princess Tutu features a female hero and protagonist, as well as following the character arc of other female characters and focusing on their relationships with each other. Fairy Tale/Classic Ballet Gender roles tend to be subverted, the most obvious one being the princess as the protector and savior of the Distressed Dude prince. A big theme of Princess Tutu is agency and reclaiming it, and since a lot of the characters struggling to reclaim their agency happen to be female, there’s obviously a bit of a feminist component to that metaphor.
I added pictures to this!