A popular 2D animation tells the story of two friends (a boy and a girl) who share a book to write a collaborative story. The boy writes his self-insert character gaining powers from a legendary sword, while the girl playfully retcons the story to have her own character take the sword instead.
Here are some interesting stories and animations related to your search: 2 (1).mp4
If you are looking for general stories involving "two" characters or themes, here are a few notable options: A popular 2D animation tells the story of
A stage adaptation trailer titled Trailer 2 (1).mp4 follows Danny and Dino on a quest for the last two concert tickets. Several videos in children's learning series use this
Several videos in children's learning series use this naming convention, such as Uncle Fred and Me from Storyfun 2 or the Two Friends and the Bear moral fable.