Hanharr is a Wookiee bounty hunter in The Sith Lords, and can play different roles within the game, depending on the alignment of the player character. Hanharr is encountered on the planet Nar Shaddaa, as is Mira, another bounty hunter. One of these will join the party of the Jedi Exile, as is determined by the personality of the player character. Light-side players are joined by Mira, dark-side players are joined by Hanharr.
Source: Wikipedia, "List of characters in the Star Wars: Knights of the Old Republic series", available under the CC-BY-SA License.