WITHOUT SPOILERS (especially for the dark tower): In your opinion, who in Stephen King's works is worthy of the Gunslinger title

I want specific reasons for why and maybe why not a character is a gunslinger, without spoiling too much. For example maybe Beverly is worthy of the Gunslinger title because of her ambition and how her aim is true.

I want specific reasons for why and maybe why not a character is a gunslinger, without spoiling too much. For example maybe Beverly is worthy of the Gunslinger title because of her ambition and how her aim is true.