One common theme could be cooperation. Given their different backgrounds (Ben 10 with his alien powers and Fem Shepard being a military leader), they could team up to face a common enemy. Another theme might be the clash of different worlds. Ben 10's world of aliens and superpowers and Fem Shepard's more sci - fi military universe could create an interesting dynamic.
Common themes often revolve around power and responsibility. Ben 10 has great power with his alien forms, and Fem Shepard has a lot of responsibility as a leader. Their stories might explore how they handle these aspects. Also, friendship or partnership is a theme. They could learn from each other and grow together in the fanfiction stories.
Love and relationships could also be a major theme. Her mixed heritage might influence who she is attracted to and how others perceive her in terms of relationships. Maybe she has a special connection with a Tarian character because of her heritage, or perhaps she has to overcome obstacles in a relationship with a human character due to her being half - Tarian. Also, her family background, which is now a mix of human and Tarian, could play a role in how she views love and commitment.
A major theme is self - discovery. The OC, through their interactions with Fem Shepard, discovers more about themselves. Also, the theme of loyalty often shows up as they stand by each other in tough situations. And there's also the theme of sacrifice, where either the OC or Fem Shepard might have to make sacrifices for the greater good.
One common theme is friendship. They often explore how fem ponyboy and curly shepard form a bond despite their differences. Another theme is self - discovery. The characters usually grow and learn more about themselves through their interactions.
I'm not sure about specific 'ben 10 and fem shepard fanfiction' off the top of my head. But usually, in good fanfiction, the author tries to stay true to the essence of the original characters. So in this case, Ben 10's powers and Fem Shepard's leadership skills would probably be key elements in the story. You might have to dig around a bit to find really great ones.
One common theme is her relationships, like her romantic relationships with other characters in the Mass Effect universe such as Garrus or Kaidan. Another theme is her leadership during difficult missions, showing her strength and decision - making skills.
A common theme is adventure. Since the original show is about Ben having adventures with his alien forms, fanfictions often continue this trend with Gwen also being involved in exciting escapades.
Adventure is also a big theme. Since they are in a sci - fi universe, they go on various quests and missions together. This gives the fanfiction an exciting backdrop to their relationship.
One common theme is love and romance. Their relationship is often explored in depth, from the initial attraction to deeper emotional connections. Another theme could be adventure. Since they are both part of the Mass Effect universe, fanfictions might incorporate their adventures together, fighting against the Reapers or exploring new planets.
Adventure is also a common theme. Since they are both from a universe full of action and exploration, many fanfictions have them going on new missions or exploring uncharted territories together. And of course, there's the theme of mutual respect. They respect each other's skills and abilities, which is shown in various ways in the stories.
Another theme is the exploration of different species' cultures. Since Shepard is human and Garrus is a Turian, their relationship in fanfiction often involves learning about and respecting each other's cultural differences. For example, how they deal with Turian and human social norms in their relationship. This adds a layer of depth and complexity to their interactions.