I really love heavy armor + two-handed, with the weight/movement penalties negated via Steed or Conditioning. There are a few different kits that look really great, and because two-handed weapons have such a far reach and wide swing radius, that type of build can be very fun to play in third person.
I also love going with a light spellsword/nightblade. The Diadem of the Savant is a gamechanger for that type of build, as it lets me avoid all those ugly light helmets while still benefitting from perks like Unhindered, Well Fitted, and Wind Walker. Being able to swap between a couple different schools of magic, and supplement with a sword or war axe, is so fun.
As you can probably tell, I basically love fast-paced, melee-based builds.
Stealth is always useful in any build of mine. I don't primarily use it for sneak attacks or making the game too easy that way, but for tactical planning and taking my time.
I always found pure mages or heavy magic users a ton of fun. Having that full spell book full of combinations is so awesome.