Yes, let's disregard late game where you're a master of all trades, we all start somewhere, usually focusing on a handful of skills to master. I personally have probably started at least 50 different character builds since Skyrim came out, but there's at least one I feel that in hindsight always seemed like the most fun to play as.
For me it's the Conjuration Archer: Focusing mostly on Archery and Conjuration with some Sneak and a touch of Alchemy thrown in. I love to play ranged characters, and mixing bows with conjured minions who can tank for you is a real blast, and with Bound Bow being in the mix, you quickly get to the point where hoarding and recovering arrows is never a problem.
What is your all time favorite build you've had a blast with playing?