When Buffy is resurrected, she does come wrong. She is a completely different Buffy, in fact, she is an alternative one from a parallel universe.

The alternative Buffy can be:

• The one from the Wishverse.
• A Buffy who was never brought back to life after the Master killed her.
• Or one who was killed during the Acathla’s fight.

MUSTS

• Whoever version of Buffy you choose, died and went to Heaven.
• Willow tries to get rid of the Buffy she brought back to have the "right Buffy" back, Spike stops her.
• Slow-burn Spuffy.
• Buffy having trouble dealing with the intrusive scoobies.

CAN

• Buffy can be depressed but not self-destructive or abusive.
• Buffy freaking out at having a sister.

CAN’T

• The original Buffy can’t be back.