I don't think Penny is, myself being an ESE and having quite a few SEE friends. She's too brutal at times to be a true ESE. Her Fi is much more prominent and noticeable than her Fe; she doesn't make a lot of jokes, she comes and takes what she wants, etc. Of course, she's a fictional character in a long-running show and no matter how well-written her character is, she will have some out-of-type on-screen behavior. However, most of her reactions seem consistent with SEE.
Leonard is usually typed as LII, just like Sheldon, and I like him a lot but I'd like to see more different types on that show so let's think he's an ILI