I'm playing around with story ideas involving university students. Most of them are locals but I wanted to include a foreign character as a sort of outside view.
I also decided to make her Southern Californian on the grounds that that would be exotic enough for the rest of the cast (who are mostly from the north west of England) to find interesting but still familiar enough to be relatable.
I've run into a few issues with her mode of speech though, I thought that researching how people from Southern California talk and act would be fairly simple because they are responsible for a huge amount of American pop culture but the reality has proved rather different. Whilst there are plenty of pages on the internet describing Californian slang, I've been told that there are a lot of problems with them. They include a lot of stuff that a university-aged character would consider outdated (for example "grody" gets mentioned a lot but I'm told that it's considered very outdated), and they mix up slang that originates from different parts of California.
What's more, while they do discuss slang, they rarely discuss other things about the region's mode of speech that would distinguish it from other English-speaking regions. I'm aware that it was once considered a Southern Californian thing to constantly insert the word "like" into sentences but that's become common enough worldwide that it wouldn't really make it obvious where she's from if I had her talking like that all the time.
Are there any good resources out there with up to date information on how people from various regions, specifically Southern California in my case, that could help me make this character sound reasonably authentic?