A sturdy man, but with a tremendous sense of humor. Rosen feels equally at home in high-class party atmospheres as well as low-class barroom joke marathons. He is usually a hit with the ladies, but has never quite intended to settle down with any single one of them. They're just all so lovely. He's good with flattery but bad with poems, can't carry a tune in a bucket, but loves to sing loudly in the shower.

Rosen often is the perpetrator of pranks on the ship, or anywhere for that matter. They rarely hurt anyone, and if they do, he's the first to admit what went wrong and try to fix it. The man's never done a day of work in his life, born to rather rich holders. It was his family riches that boosted the immortals to their ship.

A copper of medium-large size calls Rosen his bond, Belitakuth by name. Beli is rarely without a comment on the goings on near him, he provides a great foil for Rosen when need be, but also helps him cheat at poker.