Well, 'feliz cumpleanos' means 'happy birthday' in Spanish. So this graphic novel could center around a birthday - themed plot. It could be about a young person's coming - of - age birthday, with all the challenges and joys that come with growing up, depicted in the unique visual style of a graphic novel.
I'm not entirely sure as 'feliz naviad' seems like a misspelling. If it's supposed to be 'feliz navidad' which means 'Merry Christmas' in Spanish, the back story could be related to the origin of Christmas traditions in Spanish - speaking cultures. It might involve things like the celebration of the birth of Jesus, the coming together of families, and the various festive customs like having a big dinner, giving gifts, and decorating Christmas trees.
Since we don't know much about this 'feliz cumpleanos graphic novel', the main characters could be a diverse group. Maybe there's a creative artist who wants to make their birthday extra special and their friends who help them plan an amazing celebration. Or it could be a family - centered story where the main characters are parents, children, and grandparents all involved in a big birthday bash.
I'm not familiar with 'feliz naviad' exactly. It could be a very specific or local story. Maybe it's a new term someone created for their own Christmas - related story. If it was 'feliz navidad', then there are so many aspects to the back story. There are the religious roots, the cultural traditions of different regions in Spanish - speaking countries. But for 'feliz naviad', more information is needed to really explain the back story.
In a cultural context, if 'el vate bases on el dasa story', it could mean the preservation of certain cultural values. 'El dasa story' might be a traditional story that contains important cultural elements. 'El vate' then becomes a way to carry on these elements. For example, if 'el dasa story' is about family loyalty, 'el vate' could promote the same value in a different form.