Derkeethus is one of the best followers/spouses in the game. Yet he still needed some work... at least to fit with my themed game. I had uploaded this file before, long before the Creation Kit was out. I'm still not happy with this version, I couldn't get it to import his head, he was supposed to be a different color (black with gold under his eyes). Oh well, at least he stands out some more now.

Changes:
He now has feathered 'hair' as well as his horns.
He now wears hunter03 outfit.
He's a CombatBarbarian, meaning he favors 2 handed swords and bows.
His confidence level has been boosted.
Starts off with a Steel Greatsword.
As far as I know, he's been fixed by Bethesda (no longer wanders back to Darkwater Crossing if you marry him,) and if he's not, let me know I'll get rid of that in his AI. I've never had the problem since I use AFT and My Home Is Your Home.

What I use to make him look like this:
Digitigrade Beasts and armors
JazzJR's Argonian Retexture
Bigger Argonian Tails
These files above aren't REQUIRED but they improve the look. The only thing you need to make this work is Skyrim.