>>282145981
it's basically semi canon at this point. unless the ghost was just a manifestation of Ochako's guilt, but Ochako bringing up the blood and the OfA vestiges suggests to the reader that Toga's spirit is deep down inside her

>>281599754
Possession is basically confirmed with all the official art Hori keeps putting out and the epilogue's implications and symbolism, now we just have to wait for the inevitable sequel for the resurrection of Toga.

>>280074380
Deku and Ochako better spoil her plenty when they have her