There could be a sense of relief. Kaya, who has always worried about Usopp during his adventures, would feel relieved to have him back safe, and this relief could turn into a passionate kiss. Usopp, on the other hand, might feel a sense of accomplishment, like he has finally come home to someone who truly cares for him, and that could also be expressed in the kiss.
One possible storyline could be that after a long separation, Usopp returns to Syrup Village as a hero. Kaya, overjoyed to see him, runs into his arms and they share a spontaneous kiss. This kiss could be the start of a new chapter in their relationship, with Usopp finally realizing his feelings for Kaya are more than just friendship.
I don't know the author of 'Kaya Woods Graphic Novel'. However, if you search for it on some specialized graphic novel websites or in local libraries, you might be able to find the information. You could also try asking in some graphic novel enthusiast groups on social media.
The concept of the 'best' author is subjective. But a few authors stand out in the 'naruto kaya fanfic' genre. For example, ShurikenStoryteller. Their fanfics often explore new and unique aspects of the Naruto universe with Kaya as a central character. They might introduce new jutsu or explore different relationships. Also, there's CloudAuthor, who is great at creating a vivid and immersive world for Kaya in the Naruto - inspired setting, making their fanfics quite popular among readers.
There's not enough information to fully tell the 'Kaya Ghost Assassin' story. However, if we assume, Kaya might be a part of a fictional world where assassins are trained in special techniques. The 'ghost' part could imply that she has the ability to disappear into the shadows, perhaps using some sort of magic or advanced technology. She could be on a mission to avenge someone or to protect a certain secret.
One kaya ghost story could be about a haunted kaya tree. Legend has it that at midnight, a white figure can be seen wandering around the tree. It's said to be the spirit of a young girl who died near the tree long ago.
In some 'usopp fanfiction', he might be the key to solving a mystery on the ship. Maybe there are strange occurrences that only his unique perspective and skills can figure out. This could involve his talent for creating gadgets and his sharp observational skills, which are often overlooked by others but prove crucial in these fictional scenarios.