Omg, I'm so happy you like them so much! :D I don't really have canon ages for them, but I can say that all the main characters are at least young adult age or older! So it's like, semi-up-to-interpretation? I think I'd only be uncomfortable with fic if it was NSFW, thank you for asking if it was okay to write fic! :-) And I hope you'll share your cosplay somewhere too, I'd love to see!<3