Through training. Just like in the original Naruto series, characters with multiple bloodlines would need to train hard to master their abilities. They might start with basic techniques related to each bloodline and gradually build up to more complex ones.
Some characters could develop their powers through unique experiences. For instance, if a character has a bloodline related to water and another related to lightning, being in a situation where they are surrounded by water during a lightning storm might trigger a new power or a way to combine those two bloodlines in a new way.
In such fanfictions, the powers from multiple bloodlines in Naruto are often shown in an exaggerated way. For example, if a character has Uchiha and Uzumaki bloodlines, they might be able to combine the Sharingan's visual prowess with the Uzumaki's chakra reserves and sealing abilities. It makes for really interesting and unique combat scenarios.
Another concept is the origin of these multiple bloodlines. In fanfiction, some might explore the idea that there was an ancient clan that had all these bloodlines but they were split over time. This could lead to a story where a character discovers their heritage and has to learn to control all these different powers.
Some characters might develop their gambit powers through intense training. Just like in the original Naruto series where characters train hard to master their ninjutsu, in fanfiction, they could push their limits in special training regimens to unlock new aspects of their gambit powers.
One interesting combination could be the Uchiha bloodline with the Uzumaki bloodline. The Sharingan from the Uchiha and the massive chakra reserves and sealing abilities of the Uzumaki could create a really powerful Naruto. Another could be the Hyuga bloodline combined with the Uzumaki. The Byakugan's visual prowess along with the Uzumaki's chakra would give Naruto enhanced perception and more chakra to use for powerful jutsu.
The relationships can be developed in many ways. For example, if a character has the Uchiha and Uzumaki bloodlines, other characters might be initially wary due to the power of the Uchiha but also drawn to the kindness associated with the Uzumaki. Naruto, if he had multiple bloodlines, could use his different abilities to help his friends in new ways, strengthening their bonds. For instance, using a bloodline - specific healing ability to save a wounded friend.
In Naruto multiple bloodlines godlike fanfiction, the appeal lies in the fact that it offers a chance to explore the 'what - ifs'. What if a character had the speed of the Lee family, the intelligence of the Shikamaru - like characters, and the kekkei genkai of the Kaguya clan? This exploration of extreme power combinations and the resulting character development is what draws fans to these types of fanfictions. It allows for a deeper dive into the Naruto world's potential, beyond what the original manga or anime showed.
They can develop through the new combat skills they gain from their multiple summons. Different summons bring different abilities to the table. A character might learn to use the speed of one summon and the strength of another in combination, thus evolving their fighting style. Also, dealing with the different personalities of the summons can teach a character patience and leadership.
The characters can develop differently in terms of their relationships. For example, Naruto might have closer ties with some tenants due to shared interests or goals. He could learn different jutsu from them and thus have a more diverse skill set.
Sasuke is often popular in 'bloodlines naruto fanfiction'. Given his strong Uchiha bloodline, writers can explore different aspects of his powers. Naruto also remains a favorite as his Uzumaki bloodline is a key part of many fan-created storylines. Hinata, with her Hyuga bloodline, is also quite popular. Writers might develop her abilities further or create new relationships based on her bloodline heritage.
Sasuke is often a very popular character in naruto bloodlines fanfiction. His Sharingan bloodline is full of potential for exploration. Writers can expand on its abilities, like creating new forms of the Sharingan or exploring its connection to the Uchiha clan's history more deeply. Naruto is also popular. With his Uzumaki bloodline, fanfictions can play with his sealing powers and how they might be related to other aspects of his abilities. Another popular character is Hinata. Her Byakugan bloodline offers opportunities to write about her growing in power and using her abilities in new and creative ways.