Angel, my skinny (mostly hairless) guinea pig, 21 years ago.
He may look angelic but he annoyed the hell out of my other three guinea pigs. Rescued from a dump of lab-bred animals used for dermatological testing, Angel was unsocialized and mostly unsocializable. His rubbery skin felt like a ball sack... and he didn't like to be touched and held unless he was wrapped in a towel.
We only had Angel about a year. During that time, he made a lot of trips to the vet. Unfortunately, Angel had the first documented case of melanoma in guinea pig history, something that killed him in 2005. Poor thing. We did our best to make the little guy comfortable.