LIVE POLL: Favorite Single Letter Character Movie Portrayal?

Which select portrayal of a character, known by a single english letter, in a film or series of films is your favorite movie portrayal?* (* Minimum IMDb title votes: 5000)

(Poll Notes: Honorifics, ranks and other titles are not considered part of a character's name [Mr. X, Agent X, etc.]. When different people assume the same organizational position over time in a film series [007's M, Q] it creates the illusion of a similar character, when in fact they are distinct options. Multi-film, same actor character portrayals are consolidated into a single answer option intended to span their entire series story arc and represent their full body of work.)

LIVE POLL: https://www.imdb.com/poll/3wB7Eh68T3s/

See the partial list of mono-letter monikered character portrayals here: https://www.imdb.com/list/ls500303781/