Hitchhiker

[Britney]

A hitchhiker is an individual who travels the universe without the use of a ship of their own. Popular hitchhikers are [Arthur Dent] and Ford Prefect. Contrary to popular belief, [Zaphod Beeblebrox] is not technically a hitchhiker because he owns a ship which he has stolen (see: heart of gold)
Also, it is a common misconception that a hitchhiker is someone who knows where his towel is. This fact is only true to [froody] (cool and together) hitchhikers, giving rise to the popular expression that frood really knows where his towel is. Arthur Dent and Tricia McMillan are two examples of froody hitchhikers

[Kai]

[One] [who knows] where his or her [towel] is.

[Hina Muqadas]

A being, human or otherwise, that randomly asks strangers for rides in transportation devices when in need of such a service. Their destination can vary, parts of [the galaxy], parts of America, the important places mostly. Most are [fearless], yet stupid and [reckless].

[Raeanne Dimick]

[Someone] [who knows] where their [towel] is.

[Julian]

someone who travels by getting free rides in someone elses vehicle: