Threpwood Guybrush was a Thaian who was arrested in 900 p.g. by order of king Tibianus I for stealing a duck. He was punished with a fine of 10 gold, as mentioned in a book in the Royal Archives.
According to another book in the same archives, Threpwood lived in Sunset Homes, Flat 03 until 911 p.g., but it appears to be unknown when exactly he moved in. It is likely that this had already happened before his arrest, however. During the last six years of his time there, he lived to the right of Homer Vason.
Threpwood Guybrush is an allusion to Guybrush Threepwood, the protagonist of the Monkey Island series.