This is were like Team RWBY from Volume 9 during like "The Ever After" (i think) somehow travelled back to the past, during like Volume 1 episode 2 when everyone was in the auditorium place thing.

Scenario 1: Only Team RWBY travelled back to the past. And you may like introduce your character whenever u want. You may be also there in the auditorium or introduced later.

Scenario 2: You also travelled back to the past with Team RWBY this time

And this took me a very long time to write, i can mostly feel my fingers