Hi there lovely people, I created a character sheet in booklet version (A5 -> A4 folded by the middle). Just dropping the link here in case anyone finds it useful. In the link you can find the InDesign files to modify the sheet to fit your personal taste. It's localized to English and Spanish (because I'm from Spain).
Google Drive Link
If you find any typos or have any suggestions on how to improve the sheet, let me know and will try to work on it as soon as possible.
PS: You can see how the sheet looks printed in this link: Twitter Post
PS2: Remember to select Booklet mode in printer settings!