Fernando António Nogueira Pessoa wrote under three main heteronyms: Alberto Caeiro, Álvaro de Campos and Ricardo Reis. The heteronyms possess distinct biographies, temperaments, philosophies, appearances and writing styles.
I've always rejected being understood. To be understood is to prostitute oneself. I prefer to be taken seriously for what I'm not, remaining humanly unknown, with naturalness and all due respect. — Fernando Pessoa (The Book of Disquiet)