One idea could be to make the OC a healer. Since Naruto often gets into dangerous battles, a mother - like OC who can heal his wounds would add an interesting dynamic. The OC could have learned healing jutsu from a hidden clan. Another idea is to give the OC a tragic backstory, like losing her family in the war, which makes her protective of Naruto as she sees in him the hope for a better future.
A good start would be to establish the relationship between the OC and Naruto early on. For example, the OC could save Naruto from a group of bullies in the village. Then, build on that relationship. Maybe the OC discovers that Naruto has a special power that she needs to protect him from those who would misuse it. Keep the plot focused on their relationship growth and the challenges they face together.
Well, there could be a young Jedi apprentice who looks up to the Mother OC as a mentor. This character might be on a journey of self - discovery and learning the ways of the Force from her.
In some fanfictions, Naruto's mother might be a character related to the Uchiha clan in a unique way. It could be someone who was secretly in love with an Uchiha and had Naruto as a result. Maybe she was a long - lost relative of the Uchiha who was trying to protect the clan's secrets through Naruto.
In some fanfictions, Naruto's mother, Kushina, has a special connection with the Kyuubi. For example, some stories might explore how Kushina's chakra influenced the Kyuubi's behavior. Since she was the Jinchuriki before Naruto, her relationship with the Kyuubi could be a rich source of plot development in fanfiction.
It could be a new character created by the author, like a young kunoichi from a small, far - away village. She might have special powers related to nature, like the ability to communicate with animals. This would make for an interesting dynamic when babysitting Naruto, as he's always been curious about different ninja abilities.
One of the popular mother figures in Naruto fanfictions is Kushina Uzumaki. In many fanfictions, she is often depicted in more depth, showing her relationship with Naruto in different scenarios. For example, some fanfictions might explore what it would have been like if she had survived and been able to raise Naruto. Another popular one could be Tsunade. As a strong female character, she can be seen as a mother figure in some stories, guiding and protecting the younger characters, especially Naruto at times.
A strong female ninja from a hidden village that was destroyed. She has a big heart and sees Naruto as a chance to start anew. She can teach Naruto her unique fighting style which is a blend of agility and powerful strikes.
An OC in the Naruto world might also be a foreigner from a completely different land with a strange culture. They could introduce new jutsu styles or ways of thinking. They might struggle to fit in at first but then become an important part of the village. They could form alliances with the main characters and help them in their quests. For instance, if the OC is from a land where they communicate with animals, they could use this ability to gather intelligence for the Leaf Village.
Maybe it could be an existing female character from the Naruto series who steps into a motherly role for Naruto. For instance, Tsunade. She already has a sort of protective and guiding role in Naruto's life, and in the fanfiction, this could be developed further into a full - fledged motherly relationship.