One idea could be that a character from Mass Effect somehow gets transported to the Naruto universe and has the ability to mind - control certain characters, leading to the formation of an unexpected harem. Maybe they use this power to bring together ninjas with different skills to form a unique team.
Well, a possible plot could involve a villain in the Naruto world who discovers a Mass Effect - like technology that gives them mind control powers. They start to build a harem of powerful ninjas to take over the Hidden Villages. The story could then focus on the heroes trying to stop this and free the mind - controlled ninjas. It could also explore how the different cultures from Mass Effect and Naruto clash and blend in this situation.
In some 'Mass Effect mind control fanfic', it could focus on the asari. Since they have strong biotic abilities, a story could be written where an asari with a unique biotic - based mind - control power tries to take over the Citadel. She uses her power on various species' ambassadors to gain control of key decision - making processes. However, a group of resistance fighters, including some of our favorite Mass Effect characters, band together to stop her.
One idea could be that Naruto is somehow transported to the Mass Effect universe and his unique abilities draw the attention of various female characters. They see his determination and power as something new and exciting, leading to a harem situation. For example, characters like Liara might be intrigued by his chakra abilities which are completely different from biotics in their world.
In 'Mass Effect mind control fanfic', it often works through biotic powers. For example, a character with extremely strong biotics might be able to project their thoughts into another's mind and manipulate their actions. It could also be related to some sort of new technology. Maybe a device is discovered that can send out electromagnetic waves that interfere with a being's neural pathways, allowing for mind control.
The key is to find common elements. For example, both universes have different forms of power. In Naruto, there are chakra - based powers, and in Mass Effect, there are biotic and tech powers. The mind - control aspect could be related to a new form of chakra or a corrupted biotic power. Characters from both universes could be brought together through a mysterious portal or some sort of interdimensional rift.
One idea could be that Naruto, with his unique abilities like the Rasengan and shadow clones, gets transported to the Mass Effect Andromeda universe. He could use his ninja skills to help the Pathfinder team in combat situations against the Kett or other enemies.
A possible plot is that a Mass Effect technology is introduced to the Naruto universe. Maybe a Mass Relay is found in the Hidden Leaf Village. This could lead to a whole new set of adventures as the ninja try to figure out what this strange technology is and how it can be used. Or, characters from both universes could be combined. Like a Turian with Sharingan abilities.
One idea could be that Naruto is somehow transported to the Mass Effect universe. He could use his ninja skills, like his shadow clones, in combat against the various alien species in Mass Effect. Maybe he teams up with Shepard and they learn from each other's combat styles.
One idea could be that Naruto, with his unique charm and ninja skills, attracts a group of female characters from different villages. For example, Hinata could be part of the harem, still being shy but deeply in love with Naruto. Sakura might also be there, having finally realized Naruto's true worth. And then add some new female characters from other lands, each with their own special abilities and personalities, and they all come together because of Naruto's heroic deeds and kind heart.
One idea could be an OC who is a skilled biotic but has a unique way of using their powers, like being able to combine biotics with technology in unexpected ways. For example, they could use biotics to enhance the functionality of a broken piece of alien tech they find in Andromeda.
A plot could revolve around a character from Mass Effect finding a way to use biotics to control or neutralize Tiberium. Maybe a powerful Asari biotic discovers that her powers can manipulate the growth of Tiberium in a way that could save a planet from being overrun. This would bring in the unique elements of Mass Effect's biotics into the Tiberium Wars setting.