I've never played as any of the beast races.

I've never joined the Thieves guild more than once.

I've never joined the Companions more than once.

Other than that, I've pretty much done everything at least once... including Evil In Waiting... And I felt guilty...

I personally think Shellygorath was the most beautiful. And that's coming from me, hater of fresh-skinned Nord women...

Done everything except getting block, restoration, heavy, light armor to 100 and the ebony warrior and never going to.

I'm in that boat with my main character. Various face texture mods have her look completely different, when the first time around she looked perfect. I've been unable to get that look back, even with texture roll backs.

...

never ... lasted long enough to really do anything fully before rerolling a new character

I have

- never killed Nazeem (I have reduced distance greetings mod installed though so NPCs aren't annoying in my game)

- never killed anyone or anything in the game just for fun. I don't get any enjoyment from mindless killing.

- never made a female character. I wouldn't be able to roleplay her. Also if I played a female then I couldn't marry anyone...

- never made a beautiful character. Prince Charmings (or Princesses) aren't my style.

Same.

I still haven't killed Tullius. YET.

I've never made an ugly character...

Never played as a female

Never played as wood elf, redguard, imperial, and Breton

Never killed a bunny

Never used a single illusion spell

-Never did the entire stormcloak side of the civil war.

-never completed the vampire side of dawnguard

-never carried more than 30 sweetrolls with me.

Ah yes, almost forgot. The one singular thing I have NEVER done: I have never, ever killed Paarthurnax. Ever. Nor will I ever.

Same as me, I've done the entire questline once but never joined with any character after that.