Another theme is her relationships with other characters in a non - romantic way. For instance, her mentorship or being mentored. Maybe she's teaching a young rebel some combat skills, or she's learning from an older, more experienced character about the ways of the galaxy.
One popular theme is her role as a Mandalorian. Fanfictions often explore her connection to Mandalorian culture, like her use of traditional Mandalorian weapons and armor. It could be about her reclaiming lost Mandalorian knowledge or teaching others about it.