Esquivel is the co-creator (Along with artist James Fry) of the Sonic The Hedgehog Villain "The War Walrus", and the co-creator (along with artist Carl Scacchitano)of the Mega Man villain "Dubstep Man".
Esquivel is the author of the of G.I. Joe novella "Storm Shadow: 21st Century Boy", featuring the popular characters Storm Shadow, and Snake Eyes.