[1] Diniz's first professional works were in 1997 and 1998, when he participated in two projects of Taquara Editorial: Tiririca em Quadrinhos and O Estranho Mundo de Zé do Caixão, respectively comics adaptations for the clown Tiririca and the movie character Coffin Joe, created by the filmmaker José Mojica Marins.

In 1999, Diniz released his first independent comic: Subversivos, about the armed struggle against the Brazilian military dictatorship.

In 2001, Fawcett won Troféu HQ Mix and Prêmio Angelo Agostini, respectively in the categories "best national graphic novel" and "best new release".

[3][4][5] Nona Arte provided its comics in digital format through PDF files free of charge, even those that were sold printed.

Other prizes won by Diniz were: Troféu HQ Mix for best writer in 2004, 2010 and 2012; Troféu HQ Mix for international highlight (that awards Brazilian artists who had his works published internationally) in 2013, 2014 and 2015; Prêmio Angelo Agostini for best writer in 2001; and Jayme Cortez Trophy (that awards great contributions to Brazilian comics) in 2004.