Their relationship can be developed through shared combat experiences. For example, they could be in a battle where they have to cover each other's backs. This would create a sense of trust. Then, they could start to communicate about their different combat strategies and learn from each other. This exchange of knowledge would deepen their connection.
One plot idea could be a story where a male Spartan and a female Arbiter have to team up for a mission. They start off distrusting each other due to their different species and cultures. But as they face challenges together, like fighting off a common enemy or solving a mystery on an alien planet, they gradually learn to respect and rely on one another. Their relationship could develop from mere comrades to close friends or even something more romantic.
The story could be set in a post - war scenario where the male human and the female arbiter are part of a reconstruction effort. They have to work together to rebuild a planet that was destroyed during the war. Their relationship starts off as a professional one but as they face difficulties like resource shortages and hostile survivors, they grow closer. They learn to rely on each other's skills, with the male human's engineering skills and the female arbiter's leadership abilities complementing each other.
Perhaps the story could revolve around a diplomatic mission. The male human is sent as an envoy to the Arbiter's people. The female arbiter is assigned to protect and guide him. Along the way, they have to navigate through political intrigue within her own people. The male human, with his different perspective, helps the female arbiter see new ways to solve the internal issues. And in the process, they develop a deep bond that transcends their species differences.
One possibility is that they could be allies in a fight against a common enemy. The Female Spartan 117 with her combat skills and the Arbiter with his leadership and knowledge of Covenant technology could make a great team. They might start off distrusting each other, but as they face challenges together, they come to respect and rely on one another.
They might interact with a sense of mutual wariness at first. The Female Spartan 117 is a product of human military might, and the Arbiter has a long history with the Covenant. But as they learn more about each other's goals, they could start to cooperate. For example, if there is a new threat emerging that endangers both humans and the Arbiter's people, they would have to put aside their differences.
Some of the best characters could be those side characters that help the female Spartan X and the female Elite in their adventures. For example, a human engineer who helps them upgrade their weapons or an Elite elder who gives them advice on how to deal with certain inter - species issues. These characters add more depth to the story.
In some fanfiction, a female Spartan X and a female Elite end up in a parallel universe where they have to work together to find a way back to their own worlds. During this time, they share their combat techniques and develop a deep friendship that defies the long - standing hostilities between their races.
One great story in Halo Spartan X Elite fanfiction is 'The Elite's Redemption'. It focuses on an Elite character who has to overcome his past actions in the war against the Spartans. The story is really engaging as it shows the internal struggle of the Elite, making it more than just a typical war - themed fanfic.
One interesting storyline could be them teaming up against a new, powerful alien threat that neither the UNSC nor the Covenant remnants can face alone. They start off distrustful but gradually learn to respect each other's skills and cultures.