Well, think about Reyna. She's strong, independent, and has interacted with Percy in important ways. She could be part of the harem. Also, Thalia, with her fierce nature and being a daughter of Zeus, would make an interesting addition. Then there's Calypso, who has a history with Percy. She might be in the harem too. Each of them would bring different dynamics to the group, like Reyna's leadership skills, Thalia's combat expertise, and Calypso's knowledge of different places.
Annabeth could be a likely member as she has a deep connection with Percy already. Another could be Piper, given her charm - speaking abilities and her friendship with Percy. And maybe Hazel, with her unique powers and kind heart.
Some potential members could be new characters as well. For example, a daughter of Aphrodite who has a special ability related to love and attraction. She could be drawn to Percy because of his heroic deeds. Or a nymph from a secret grove who Percy saves from a monster and then she becomes devoted to him. There could also be a demigod from a far - off land with powers related to nature, and she joins Percy's harem after they go on an adventure together.
Annabeth could be one. She's been Percy's close friend and has a strong connection with him. Also, Piper could be a part as she has her own charm and abilities. And maybe Thalia, with her fierce nature.
How about a daughter of Hecate? She could have magical powers that would complement Percy's skills. The Fates might bring her into Percy's life because they know that her powers could be crucial in future battles or quests. And then there's Calypso. She already has a connection with Percy, and the Fates could make it so that she becomes a more permanent part of his life, adding to his 'harem' situation.
There could be some new original characters in his harem. For example, a time - traveler from the future who got stuck in Percy's time due to a time - rift. Also, a nymph who has a special connection to the concept of time and was drawn to Percy when he became the god of time. And of course, Hazel might also be part of it, with her ability to manipulate the Mist and her connection to the Underworld adding a unique aspect to the harem.
In a Naruto and Percy Jackson mass harem fanfiction, Naruto's side might include Tenten and Temari. They are strong and independent characters who could add interesting dynamics to the harem. For Percy Jackson, Reyna could be in the harem. She has leadership qualities and her Roman heritage could bring in new elements. And let's not forget some minor characters from both universes could be given more spotlight in the harem, like some of the nymphs from Percy Jackson's world or some of the kunoichi trainees in Naruto's world.
Obviously, Annabeth Chase could be one of the main characters in the harem. She already has a strong connection with Percy. Then, there could be Thalia Grace, with her cool and powerful demigod nature. From other mythologies, Artemis could be an interesting addition. Despite her vow of chastity, in a fanfiction world, she could be drawn to Percy in a different way. Also, maybe a character like Katara from Avatar: The Last Airbender could be brought in through some sort of crossover magic, adding an element of water - bending to the mix.
Athena would be a likely candidate. Given Percy's growth in intelligence and strategy over his adventures, Athena might consider him a worthy addition to her circle. Demeter could also be in the harem. Percy's connection to the earth and his ability to grow and adapt could attract her. And of course, Poseidon's relationship with Percy could lead to some interesting dynamics if Amphitrite, Poseidon's wife, were to be part of the harem in some way.
Definitely Annabeth. Since she has a strong connection with Percy already, in a time travel scenario, she could be one of the main characters in the harem. Also, Piper could be there. Her charm - speak ability might play an interesting role in the harem dynamics. And perhaps some of the minor female characters from the series like Silena Beauregard could also be included if Percy travels to a time when she was still alive.
Potential members could include Tenten from Naruto's world. She might be interested in Naruto's adventures in a different universe and become part of the harem. In Starfire's world, there could be a scientist - type character who is fascinated by Naruto's ninja abilities and the concept of chakra. This character could start to develop feelings for Naruto as she studies him more closely, thus joining the harem.
Sakura could be a potential member. She has a long - standing relationship with Naruto and her skills as a medical ninja could be an asset to the group. Ino might also be part of it. Her mind - control jutsu and her strong personality could add an interesting dynamic. Tenten could be there too, with her weapon expertise. These characters already have connections to Naruto in the original story, and in a harem fanfiction, they could form a unique relationship with both Naruto and Kurenai.
Sakura could be a potential member. She has always had a connection with Naruto, and in this harem scenario, her feelings could develop further in a different way. Also, Hinata, with her long - standing love for Naruto, might be part of it.