The fic idea:
Haruno Sakura is two when her inner self admits that he is from a different world. Sakura is too young to get it but she does keep the secrets about the Kyuubi and Uchiha clan.
She asks her parernts to let her stay in the park. She oversees that Hinata and Hanabi were bullied for their weird eyes and she stepped in unknowingly gaining two friendships and romances.
This is how he was there when Hinata was kidnapped. He slept over, it was on the twins third birthday so he could stay. He warned them to be careful and with the help of an Anbu (he shouted for one playing up that he saw the future) Kakashi they stopped he kidnapping without a hitch so Neji's dad won't die. Neji still believes in fate and wants to change the fate of the branch family but he has a happy childhood.
Hinata develops a crush on Sakura and Hanabi too. Both sisters grow closer thanks to their agreement.
At age five the Academy starts. Ino and Sakura still become friends like in canon, but Sakura is bullied because he is a "social climber" and only friendly with the Hyuuga because of their status.
Sakura also tries to befriend Naruto (can be genderbent Naruko up to you) and the two of them become close.
Sakura Info:
Name: Haruno Senju Sakura
Gender: male
Clan: by blood Haruno, Senju,
by marriage Uzumaki, Yuki, Yamanaka, Hyuuga, Kurama, Kazehana
Family:
Senju Hashirama, great-grandfather
Senju Tobirama, great-great uncle
Senju Tsunade, mentor and great-aunt
Senju Nawaki, gandfather
Haruno Mebuki, mother
Haruno Kizashi, father
Yukimaru, adopted son
Powers:
Chakra nature: wood, earth and water
Kekkei genkai: Wood release, Ice release (learnt by himself and hard work)
Her summons: snake (thanks to Anko training), cats (it is close to him), dogs (Kakashi lets him sign his contract)
Sakura's harem:
(0. Uzumaki Naruko, genderbent Naruto up to you of you want her in).
1. Hyuuga Hanabi, heiress of the Hyuuga clan, younger twin of Hinata and head of the harem.
2. Hyuuga Hinata, her shy self but has a crush on Sakura instead.
3. Yamanaka Ino, same as canon but gets over Sasuke early.
4. Kurama Yakumo, Sakura was there to support her so she has a crush on her.
4. Fuu of Takigakure, she is similar to Naruto so Sakura can identify her easillly.
5. Nii Yugito, both girls have cats in common.
6. Uzumai Tayuya, here she is an Uzumaki so Sakura makes her switch sides.
7. Yuki Haku, she is a girl there and both she and Sakura can learn snow and ice release.
8. Samui,
9. Mabui, useful to make her chage sides and has a beautiful for
10. Konan
11. Uzumaki Karin, to restart the Uzumaki clan
12. Temari, political marriage after Sakura is promoted to chunin the villages saw it fit.
13. Terumi Mei, kage level has two cool jutsus and has a crush on Sakura similar to her weird thing for Sasuke
14. Mitarashi Anko, Sakura trained with Anko for a while and things led to another
15. Kazahana Koyuki, after team Seven saved her country she happily signed up to marry Sakura
16. Shion
17. Shizuka
18. Guren
19. Kurotsuchi
20. Fuma Sasame
21. Natsuhi of Hoshigakure
22. Hokuto (maybe)
23. Ryuzetsu
24. Fuka (maybe), she can be an Uzumaki too
25. Amaru
26. Tsuchiguno Hotaru
27. Pakura
28. Honoka can be an Uzumaki too