It's true that his face has a somewhat Asian look, and he exudes a calm personality that could fit in a more "spiritual-Asian" building xD at least physically, although he's a Sagittarius, and Sagittarians are quite fond of individualism and freedom, at least archetypally.

Well, it's been a while since I've read the bios, so they might be confusing. xD But basically, Justin is a time traveler, although he never admits it. He came to Enigma Academy from the future to stop the Enigma siblings and the secret society from carrying out "the harvest," which is basically making cow plants devour students in the factory to drink the elixir of life. He also wants to stop Rowan from continuing to kill Sims.

Actually, when you mentioned his face, I did find it interesting that he might live in the Shimizu house. Although I'm still wondering if it wouldn't be more interesting if that house were only for women. xD

Oh, that's clear. Another antagonist.

What communities here are greek actually?