Which character from Texas helps hunt Dracula in the novel?

The character from Texas who helps hunt Dracula in the novel is Quincey Morris.

Quincey P. Morris is a wealthy young American and one of Lucy Westenra’s three suitors. Although Lucy chooses Arthur Holmwood, Quincey remains friends with Arthur and Dr. John Seward. His friendship with the other men becomes important when they unite against Dracula.

Stoker presents Quincey as an adventurous Texan who carries a Bowie knife and speaks in the colorful style of a frontier storyteller. He also donates blood to Lucy during her illness, joining the sequence of transfusions intended to save her from Dracula’s attacks.

Quincey takes part in the final pursuit of Dracula and is fatally wounded during the confrontation near the Count’s castle. He survives long enough to see Dracula destroyed. The character is sometimes confused with Van Helsing or Seward because all three are vampire hunters, but Quincey is the only member of the group specifically identified as being from Texas.