I interpret this question in a couple ways.

First, there are my positive views, which largerly derived from study of Aquinas and Anscombe. It's somewhat tough to name a third. I suppose Aristotle is an obvious candidate (but I tend to study him through Aquinas), as is Philippa Foot, and as (in a different direction) is Wittgenstein, and as (in another sense) is Cardinal Newman. If I wanted someone to get a representative understanding of both my views and my interests, I guess it would be Aquinas, Anscombe, Newman.

The other way to take the question is in terms of philosophical development. I suppose Aquinas and Anscombe have also had an impact on the development of my views, but it's worth crediting here instead: Feser, Nozick, and Kripke. Nozick and Kripke were two of the philosophers I read fairly early in my study that I think has a large impact on how I think about philosphical problems, arguments, and prose, although substantively I'm not very close to their views. Feser of course exerted a substantial influence on the way I think about philosophy (and early on, taught me much of what I take to be Thomism). I don't list him as representative of my substantive views now, largely because many of the portions of Aquinas that most interest me these days are not the ones that he writes about (i.e. theory of action).

Proclus
Gersonides
Leo Strauss

Probably Plato, Schopenhauer, and Nietzsche.  Although Sextus Empiricus and Zhuangzi, the ancient Daoist, both get an honorable mention.