The first character I made was a mage, and this is by far my favorite class to play as. I get this feeling of utter power when I play as a mage. I could be stripped to my skin, and my inventory could be cleared, but I would still be a magical tank who can destroy anything. I play as a mage for this feeling of self-sufficiency and powerlust.
But as a mage I joined the Thieves Guild, and these missions instilled in me a craving for stealth. Something about being an invisible influence is what drew me, almost as if I were some sort of god. It was hard work at times and it took a lot of planning, but nobody had to know that. The next time my victim opened his strongbox, he would know that I had struck again, and that is all that matters.
I finally created a warrior character. I honestly didn't think I would like it, but I did. I no longer can stand away at a distance and take out my opponents without being in any real danger. Now it's time to confront my enemies head on, and the combat is literally adrenaline-inducing.
My point is that if you have been sticking in your comfort zone with one specific class of character (which is what I did for a long time), you may be cutting your potential enjoyment in thirds or fourths. Get out there and explore.
My next experiment...vampire.
