The Ace: Considered this amongst clerics in combat as well as his ability to find hidden emotional content. Not so much in his ability to actually realise people are feeling though.
Badass Longcoat: The Grammaton Cleric's standard combat outfit is a longcoat.
First Time Feeling: Hits him hard, not least because, at the time, he's found and is listening to an old vinyl album of Beethoven's Ninth Symphony, one of the most tremendously moving pieces of music ever produced by the human species. Even the script describes this introduction to human emotion as 'unfair'. (But it does a lot to explain his subsequent actions.)
Guns Akimbo: He almost always wields two guns simultaneously.
The Gunslinger: He's an absolute expert in armed combat and the most lethal gun-wielding character in the film.
Man in White: In the climax he's clad in a completely white cleric's ceremonial uniform.
Offhand Backhand: Pretty much any shot Preston makes falls under this trope, since Gun Kata eliminates the need to actually aim.
Roaring Rampage of Revenge: He goes on a rampage after DuPont reveals his deceit, slaughtering dozens of minions in the hallways. Minus the "roaring" part, as gunkata requires emotional control.
Showy Invincible Hero: The director finds it boring when the villain "gets a few good licks in" on the hero because he has no intention of subverting audience expectations with a Bad Guy Wins ending, and thus, there's no point in making it seem like the villain has an advantage at all when the result is a foregone conclusion. He does acknowledge that not everyone likes this approach. And yet, for all Preston's physical invincibility, he turns out to be incredibly emotionally vulnerable.
Large Ham: When he confronts Preston that a sense offender has infiltrated the Grammaton clerics' ranks, he suddenly shouts "ARE YOU PLAYING WITH ME, CLERIC?!" This is foreshadowing that DuPont himself is no longer using Prozium.