What would the Japanese think of a very quiet foreigner?

Question:

I'm just wondering, in case I end up going to high school there soon as a foreign exchange student.

Answer:

I think quiet/calm foreigners are more welcome, rather than "loud" ones...
To recall those foreign students on exchange program in my high-school, we would feel more UNcomfortable with "loud" ones. Especially we didn't like students saying like "Do you speak English!!?" hysterically.
Quiet people are usually thoughtful. Don't worry.
------- edit;
Those students had almost zero knowledge of Japanese when they arrived, so they naturally kept quiet, unless someone spoke to them in English.