Ricky Ricardo in I Love Lucy.
Mr. Roarke in Fantasy Island.
The goofy sidekick character in Chuck
Betty in Ugly Betty
The fat guy on Lost
Commander Adama in the re-imagined Battlestar Galactica
The guy in Heroes who painted pictures which predicted the future.
I think there are a lot of Hispanics in TV shows.
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And I know that people are going to name a lot more characters played by Hispanic actors in the comments, but the most interesting are roles in which you never even knew the guy was Hispanic.
For example, I watched the entire re-imagined Battlestar Galactica, and I never realized that Commander Adama was played by a Hispanic actor.
And when I was a kid watching Fantasy Island, I never thought of Mr. Roarke as being a different race than me.
Cameron Diaz was never on a TV series, but the first time I saw her in a movie, I had no idea I was watching a Hispanic actress.
There are a bunch of Hispanic characters in one of my favorite shows, Dexter, but they play people with Cuban accents and they realistically represent the actual diversity of Miami. They belong in the show, but it's not as interesting as discovering that Commander Adama is Hispanic.