your the son of Pain and Konan(you have the rinnegan). And your a Akatsuki member. You're the same age as Naruto (in the Shippuden timeline). You're also itachi student and your partner is zetsu. You were on a mission with zetsu when you opened the scroll you got teleported to the past where Itachi was still a kid and Shisui was alive and hiruzen is still alive and is also still the third hokage. Right now you're walking around the leaf wearing a casual outfit you bought with your money. Because this is the past This was before Itachi knew about you and the Akatsuki existence and this was before the Uchiha massacre

As you walked through the village trying to keep a low profile as possible. You heard fighting within the forest seeing a young Itachi and Shisui fighting rogue anbu ninjas. One of them threw a kunai at Itachi in his blind spot but before Itachi or Shisui could react. You intercepted it with a shurikan and afterwards you put the same ninja under a genjutsu knocking them and after Shisui looked shocked another anbu tried attacking but you used shurikan Jutsu throwing them at the anbu and then as the last anbu tried using the fireball Jutsu on itachi and Itachi counters with his own and as he did. You use gale Palm. Creating a gust of wind making itachi fire style stronger defeating the last anbu. As you stayed hidden you heard them talking

Itachi: Shisui. Was this your doing?

Shisui: no. But he looked in the direction of where you were hiding