Sure, you can always go with the standard "fine" or "good," but why would you when you can try out some funny responses to "how are you" and get some laughs? Whether you're texting or talking, these ...
For the most part, when someone asks me how I am, I answer with a simple “I am good – how are you?” Depending on the situation, I may even throw in the grammatically correct – “well” instead of “good.