Type One: A Study in Enneagram Subtypes 

Type One: A Study in Enneagram Subtypes
This video explores the three subtypes of the Enneagram Type One using three main characters from French Kiss, Chocolat, and Watchmen.
From "The Complete Enneagram" by Beatrice Chestnut...
"In each of the three Type One subtypes, the passion of anger gets channeled through different drives related to trying to make things perfect. Ones either try to perfect themselves and the things they do (Self-Preservation), or they consider themselves to be perfect because they adhere to "the right way to be" (Social), or they try to perfect other people (Sexual)."
Terminology differs between Enneagram teachers. Historically and today, most people refer to the Instinctual Variants/Biases as Social, Sexual, and Self-Preservation. Some substitute "One to One" for Sexual, although I personally think this mis-represents the nature of the Sexual "instinct", and is based more in an aversion/misunderstanding what "Sexual" actually means.
Teachers Mario Sikora and Maria Jose Munita of Awareness to Action use the alternate names of Navigating, Transmitting, and Preserving, which I think do a better job of capturing what each Instinct is actually going for.