The Emperor is also a common character. Fans like to imagine how his actions in different time periods could change the fate of the galaxy. His vast power and knowledge make for great time - travel - related storylines.
Space Marines like Ultramarines or Blood Angels are frequently used. Their loyalty and combat prowess can be put to the test in time - traveling adventures, such as being sent to a time where they face new and unexpected enemies.
The Space Marines are very common main characters. They are genetically enhanced super - soldiers, and their stories often revolve around their missions to protect the Imperium.
Often, there are tech - priests among the main characters. They are crucial as they can understand and potentially repair ancient technology. Their knowledge is both a blessing and a curse as it makes them targets.
Master Chief is often a central character. His iconic status in the Halo series makes him a natural choice. Writers might send him back in time to change crucial events. Another popular character is Cortana. Her intelligence and connection to the Halo technology can create interesting time - travel scenarios, like she uses her knowledge to prevent a system malfunction in the past that would have had catastrophic consequences.
Connor is often a popular character. His ability to adapt and his complex relationship with humans and his own identity make him a great candidate for time - travel scenarios. He could be sent back in time to change the course of the android - human relations he was initially a part of.
The Space Marines are often included. Their strength and honor make them appealing protagonists in a harem scenario. For example, a Ultramarines chapter member could be the center of a harem with female characters being drawn to his noble deeds.
In Warhammer 50k fanfiction, characters like the Sisters of Battle are quite popular. They are strong, devout warriors, and their stories of faith and combat can be really inspiring. There are also Inquisitors who are often central characters. They have the power to investigate and root out heresy, and their complex personalities, some being more noble and some being more morally ambiguous, make for great storytelling. Additionally, the Ork warbosses can be popular as they bring a lot of chaotic and violent energy to the stories.
Horus Lupercal is a very popular character. His fall from grace and the events leading up to it are often the focus of fanfictions. Another popular one is Magnus the Red. His connection to the warp and his attempts to warn the Emperor make for great story material. Also, Leman Russ is popular. His no - nonsense attitude and his relationship with his legion are often explored in fanfic.
One popular character is Yvraine. She is often depicted in fanfiction as a powerful figure leading the Ynnari. Her unique abilities and her role in the Eldar's struggle for survival make her a fascinating character to write about.
Naruto himself is often a central character in space time Naruto fanfiction. His ability to adapt and his strong will make him a great fit for exploring different space - time scenarios. Sasuke is also popular as his powers and his complex relationship with Naruto can be further explored in these alternate space - time settings. Kakashi is another character that frequently appears. His knowledge of various jutsu and his wisdom can be used to explain or deal with space - time related mysteries.
Captain Kirk from 'Star Trek' is also a common character. His adventures in space can be expanded upon in fanfiction. Writers might write about him encountering new civilizations or dealing with time - related anomalies that take him to different eras.