Kallam asked Lauren Oliver:

Which character has been your favorite to write? Which character challenged you the most? Answers can include characters from Rooms too not just YA.

Lauren Oliver I don't know about the MOST, but the ghosts in ROOMS were definitely a challenge. Because they have no physical bodies, I had to make sure their personalities were very carefully delineated.

My favorite character is probably Bundle the ghost from Liesl & Po. He's an adorable cat/dog and just the most lovable thing I've ever written.

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