is a super mutant
with the distinction of having retained his civility and intellectual capacity through the rigors of mutation.
The super mutant pleads with the Lone Wanderer to be released from a cell in Vault 87 in which he has resided for as long as memory permits, imprisoned by his own kind. He claims that he was able to attain literacy and a civilized personality (things most super mutants sorely lack) by gleaning as much information as possible from the Vault's immense database which he could access through a terminal in his cell. Out of admiration and a feeling of being in a similar situation he chose to name himself after Guy Fawkes.
His intimate knowledge of Vault 87 possibly derives from having been a resident there before being transformed into a super mutant, further indicated by the fact that he wears the remains of a Vault 87 jumpsuit