I can't really answer the question of "how are you online vs. real life" with any one, precise, clear answer. Not because I lack the ability to do introspection, (although now that I mention it...) but rather because who "I" am is entirely dependant on the person that perceives me.
Everyone has their own biases and perception of the people around them and construct identities of people inside of their head- whether conscious or subconscious. If you ask what kind of a person I am to my friends, I wouldn't doubt you'd get a varied array of answers. There's probably a number traits that could and would overlap within the individual answers, but I don't think you'd get one particular trait that everyone thinks of on their own.
This extends to me, personally, too. I can do a dissection of my own character all I like, but that isn't going to stop it from being coloured by my own biases about myself- whether positive or negative. The answers I give now would also, most likely, not even be the same answers I'd give three years from this point.
The only thing I can say with certainty is that I am different IRL to online- but I wouldn't be able to tell you in exactly what way that is. I like to have a sense of humor in both personas, but my humor is different. I'm shy on both ends, but it manifests in another way.
That isn't even to mention that I don't just differ IRL to online- I differ in IRL to IRL and Online to Online too. I just don't act the same way around my family as I do my friends or my fellow university students. I don't have multiple personalities; there's only one Ammokkx, but the personality that is there is ever-changing based on the individual situations I find myself in. I'm mean to people, but I'm not mean to everyone. I'm also nice to people, but I'm not nice to everyone. I'm patient with some, not with others. I don't have a consistent personality, despite being a consistent person.
This post doesn't really have a conclusion, or point to make. It's word vomit.