] I think that is probably due to the fact that more people are extroverts than introverts. As an introvert, I much prefer Elinor to Marianne. For we introverts, dealing with people is an exhausting business and we like to husband our energy, just like Elinor. Extroverts such as Marianne are like the proverbial candles that "cannot last the night" -- many extroverts literally burn out in early middle age.

...whether Marianne would be concidered an extrovert. Extroverts are people who thrive on the company of others, who gain their strength from people (whereas, as you pointed out, introverts find this exhausting, they gain strength from being alone.)

Marianne seems intoverted to me. She loves long solitary rambles by herself, Edward does not consider her "a lively girl", and she is selective in who she chooses to be close with (though some of this may be set down to her prejudice of anyone over 27!). But take the example of the Steele sisters - Elinor attemps to be friends with them, before (and after) know what they were like, but Marianne decides that she does not like them, and does whatever she feels like to avoid them.

After her troubles with Willoughby begin, she spends much time to herself, and becomes irritable and weeps whenever she is around others. Now, I don't know how much of this could be attributed to being either intro or extoverted, but as a highly emotional introvert, I can tell you that it is possible to be both.