Gerton is a Skeith in the book 'Lupe Mysteries', who lives in poverty. He has a small shack with bare cupboards, and very little food to eat. He also seems to have some kind of illness. He was breifly a suspect in the theft of a bike, but his extreme poverty meant he was removed from the list of likely suspects.
No, not a-a-Achoo! No, not at all. Please *sniff* come in.
As Gerton only appears in a Neopian book, it is unclear if he is a character in the real Neopia.