Most challenging build in Skyrim?

So yeah,
I just feel like start another adventure on this overrated yet amazing game. The thing I'm having a hard time deciding what perks to use. Sometimes I think they made this game a little bit more "casual" as there's not too much to choose or to grow ( maybe I just miss too much the old format they followed up to Oblivion ).

Which one do you think is one of the hardest perk-build to do in Skyrim?
Besides Sneak + Alchemy (I made one of this already).

Are you talking about something like this?
Seems like a pretty challenging build to me.
http://kotaku.com/5867385/hes-level-35-i...is-dragons

[video=youtube;iKW6vYe_1Qg]http://www.youtube.com/watch?v=iKW6vYe_1Qg[/video]

There was also this guy who made a point of never killing anything, ever. Using illusion spells, turn undead, calm animal, healing, fear and running to complete fetch quests without having to kill any enemies.

You should become an Unarmed Badass.


[video=youtube;uhBiNx749Zw]http://www.youtube.com/watch?v=uhBiNx749Zw[/video]

Pacifist looks really really challenging.
And the unarmed... well.. it looks... BADASS!
Haha!
I'll go with both. First the pacifist. C=
Thanks for the input.

You should become an Unarmed Badass.


[video=youtube;uhBiNx749Zw]http://www.youtube.com/watch?v=uhBiNx749Zw[/video]

This alone makes me want to do this

Did someone say robbaz?

[video=youtube;wUgNOLha89E]http://www.youtube.com/watch?v=wUgNOLha89E&feature=related[/video]

Are you talking about something like this?
Seems like a pretty challenging build to me.
http://kotaku.com/5867385/hes-level-35-i...is-dragons

This is my current character. It's more a game of patience than "challenging". It does make the game more fun than just hack'n'slash/sneak/etc.

There are cheats to getting around the need to kill things yourself. Since you don't get the kill count unless you deliver the fina blow, you can attack things without killing them or use followers (although follower kill counts will count as yours if they are still under your command). And then there's payin for trainers for level ups.

[video=youtube;tkyxQbZx63w]http://www.youtube.com/watch?v=tkyxQbZx63w[/video]

Stats:

 Spoiler

The hard part is finishing a questline.

My friend is doing the Nord Badass guy, says it is pretty dam difficult.