Bogroll is a twoll in the service of Stanley the Tool. He was originally a henchmanErf-b1-p004 ("the lowest henchman", according to himErf-b1-p085). Later, he was promoted to lackey in attendance on Lord Hamster.Erf-b1-p028
Bogroll is, to all appearances, a simple follower. At his first appearance, he was about to become the (literal) target of a prank by one of the other henchmen. Wanda's desire to get "as far away from (him) as possible" when she encounters him holding a target-patterned parasol suggests that this is a recurring pattern.
After being promoted to lackey, he made a suit of armor for Parson and otherwise served him loyally. Parson, in contrast to the other characters, treated Bogroll with respect, something which may have influenced and inspired Bogroll's infatuation and fierce loyalty towards Parson. So much so, that he is currently deceased, KIA in service to Parson.
Real World References
Bogroll is one-eyed - a reference to cyclops.
His name is a British English colloquialism for toilet paper.