I was just wondering if anyone else has done this. I used the console command to make Senna a follower. On one character that is already high level and pretty uber, I also used the console to adjust Senna's stats and gave her some conjuration spells. You have to give her a lot of magicka since she can't get any perks to reduce magicka costs.

She also has the Sanguine Rose and some other good enchanted items. And just for fun I also take her clothes off and just equip her in Ebony Gauntlets and Boots, since I also have the nvde mod she cracks me up running around kicking ass with her ass hangin' out. I know I am a perv but hey it's my game.

Get the NPC editor http://skyrim.nexusmods.com/downloads/file.php?id=4554

You can tweak things like appearance, AI, and default armor.