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 sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
I don't have enough information to say exactly who Cap'n Kathy is. She could be an original character created by the fan fiction writer. Maybe she's a pirate - the 'cap'n' part could suggest that - who has some connection to the wizarding world of Harry Potter.
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.
The cap man and monkey story is an interesting one. There was this cap man who was traveling around selling his caps. He reached a place near a forest and decided to take a rest under a tree. While he was sleeping, the monkeys in the tree noticed the caps. They climbed down, grabbed the caps, and went back up the tree. When the man woke up, he was confused at first, then saw the monkeys with his caps. He was worried as those caps were his livelihood. But then he remembered that monkeys often mimic human actions. So he took off his own cap and tossed it. The monkeys, being the imitators they are, did the same with the caps they had taken, and the cap man got his caps back.