He began as an amateur theater actor and scenic painter until moving to São Paulo in 1961, where he graduated in Advertising at USP.

He then found a job as a freelance copywriter for the newspaper Última Hora, until he was hired by Editora Abril in 1972 to write for children.

In 1986 O Fantástico Mistério de Feiurinha was awarded the Prêmio Jabuti, and a film adaptation of the book, directed by Tizuka Yamasaki and starring Xuxa Meneghel, was released in 2009.

[5] In March 2017 Bandeira announced his first novel intended for adults, Melodia Mortal, written in partnership with infectiologist Dr. Guido Levi.

But, since 1962, Pedro had also worked in the area of journalism and advertising, starting at the newspaper Última Hora, a branch in São Paulo, and later at Editora Abril, where he wrote for several magazines and issues.