Ramonda, Shuri's mother, can also be a significant character. Her wisdom and experience can play a role in the fanfictions. Maybe she tries to mediate between Shuri and Killmonger, or she has some secret knowledge that can help Shuri deal with Killmonger. Her presence can add a touch of family and tradition to the often - chaotic and unpredictable world of Shuri and Killmonger fanfiction.
A more complex plot could involve Shuri using her scientific skills to try and rehabilitate Killmonger after his defeat. She delves into his past traumas and tries to heal him, not just physically but also mentally. This could lead to a transformation in Killmonger's character, and a new relationship dynamic between him and Shuri that challenges the traditional views in Wakanda.