When attempting to learn a second language, extroverts and introverts are likely to take on different approaches where learning methods are concerned. That said: there are more than just a few misconceptions surrounding character with the ability to learn a second language.
Extroverts can engage more seamlessly with native speakers of the target language they are trying to master. This interaction is hugely beneficial when learning a new language.
Extroverts have an ability to engage with others. This greatly enhances their own speaking skills. This type of person will thrive in the classroom environment, as there is much interaction from fellow students because of the constant need to communicate that drives an extroverted character.
All too often, when we learn a second language, words will fly by at such a rate, we overlook them. Introverts will have a larger passive vocabulary, simply because of an innate ability to listen and learn.
Introverts and extroverts both have the ability to speak and write in a second language. There is no better approach from one character trait over another. The style of learning is certainly different and the approach incomparable.
Schottenstein, Yana. "How Introverts & Extroverts Learn Second Languages." Lao Alphabet, Pronunciation and Language, www.omniglot.com/language/articles/introextrolanglearning.htm.