okay good igor responded, I was getting nervous, nevermind my last PM, Rater its all good.

so here is my ideas for how to integrate Senko:

-Yuyuyu could walk up to wherever she lives with a letter about something and deliver it to her, starting at least a conversation now, if you want some preamble before the mission.

-Jirou recognizing he won't be able to meet with Senko as often with his Otokage training beginning will talk with the Otokage about about Senko to assign the mission to Team 3 so they can help care for her and befriend her while also saying it would be good for Kimiko to get used to people different from her, and Usagi to have someone to she can relate to in some way because Senko also has a chakra handicap. and of course is the one to introduce them to her the next day.

from there we can proceed as normal I think, and just character interactions play it out.