Shikako being reborn into an older generation and becoming Sakumo’s genin teammate? She and Sakumo remain like best friends and when he has Kakashi, she helps raise him? And, upon Sakumo’s death, Shikako becomes Kakashi’s guardian or something?

Oh, dear sweet angel of an anon. I’m sorry, but I don’t think I can fill this prompt. It’s an interesting idea to be sure, but I have a bit of… conflict of interest, I guess you could say.

I already have a series for an SI!OC also in the Sannin/Sakumo generation. It’s called (In)Difference and it’s about Kiyoshi Utsugi–the kunoichi on the same team as Dan Katou (aka, Tsunade’s beau) and Kunugi Mokume (some random ninja who had a full name, is approximately the right age, and was possibly crying when Dan died). And… she’s kind of Kakashi’s mother.

I haven’t written much for it, and not even very recently either, but I wouldn’t feel comfortable in diverting my era-specific attentions away from that series. I mean, arguably, since Sakumo’s kunoichi teammate isn’t my character, she very well could have been a Shikako reborn. But that kind of takes away from my story. And I sort of also have plans for Sakumo’s genin teammates. Unfortunate plans.

So… thanks for the prompt, anon, but I don’t think I’ll be filling this one. I’d be more than happy to help you brainstorm the idea if you want to take a stab at it yourself–similar to the back and forth collaboration I have with @kuipernebula for Team Medic–but I’m afraid I can’t commit to anything more than that.