Pardner

A pardner is an NPC who can accompany you and fight on your side during encounters with bad guys. Typically, you must first complete a quest for them, or involving them before they can become a potential pardner.
 * Crazy Pete
 * Doc Alice
 * Susie Cochrane
 * Gary the Goblin (Not available in hard mode)
 * Buffalo Buffalo Buffalo Bill (Not available until Buffalo Pile)
 * Florence the Ghost Hunter (Exclusive to Reckonin' at Gun Manor)

You can only have one of Pete, Alice, Susie or Gary as your pardner, and your choice cannot be altered once made.

Buffalo Buffalo Buffalo Bill, however, is an additional pardner, who can coexist with the others.

Florence the Ghost Hunter is a semi-pardner, and is only available within Gun Manor at some fights, but like Buffalo Buffalo Buffalo Bill, can coexist with the others.