In the English language I can only do a neutral American, New Yorker, Hindi and Jamaican accent. I can fluently speak, write and understand it. It is the language in which I am most comfortable with.
In the Japanese language, I can only speak and understand the basics. It is my favorite language and I'm still in the learning process. Nonetheless, if you give me a paper with the words in romaji (or phonetically-written), I can pronounce them with ease. I've been listening to Japanese cartoons and soap operas for nearly my whole life, so I have a good idea of the pronounciation of the words, even if I don't understand them completely.
In the Spanish language, however, I can do a little bit more than just fluently speak, write and understand it. I can do Spanish (Spain), Dominican, perfect Puertorrican (my homeland) and Mexican accents with hardly anyu trouble. It is the second language which I feel the most comfortable with.