Fissif

Fissif is a thief from Buccaneer's Den the Avatar meets in Ultima Underworld II.

Fissif stole various things from the castle, while the inhabitants were asleep, but he had bad luck, and was locked in with the others, when the Guardian errected the Blackrock Dome. Confronted by the Avatar in the sewers, where he hid, he returned the Pocket Watch to him/her.

After the Avatar made it clear that it was either to surrender and go to prison, or starve and die in the sewers, Fissif surrendered. He was found in the prison, where he was willing to sell his lockpicks and show the Avatar, how to actually use them.

Trivia

 * Of course, going rough with Fissif will make him become pretty useless, since he will remember that.
 * Fissif also had noticed, that the Fellowship members that did escape, were meeting in Buccaneer's Den, planning something. Most likely they were waiting for the invasion from Atarka.