Bibi Van der Zee knows so much about campaigning and protesting, she writes amazing books about it.

When six-year-old Bibi drew a Save the Whale poster, she realised that protesting was definitely for her, and that fine art perhaps wasn't. Since then she's campaigned about war, sexism and the environment.

She also writes about politics, the environment and food for the Guardian, and has written a brilliant book called Rebel Rebel: the Protestors Handbook, which is stuffed full of tips, tricks and tactics essential to the discerning campaigner.

Her brain is absolutely overflowing with campaign knowledge; we're so excited to see how she helps our motley crew of Battlefronters.