Is it possible to get Derkeethus as a Steward? And if you can, will he actually stay in the new house, or will he keep travelling back to Darkwater Crossing like he does in the vanilla game? Also, is it possible for me to make a new follower in the Creation kit who can become a Steward? Thanks in advance if you have any information to share!

Nope he can't be a steward. Here is a list of all followers and it shows which can be a steward http://www.uesp.net/wiki/Skyrim:Followers

Ah shoot well thanks for the link! I play an Argonian and wanted an Argonian steward. I'll guess I'll have to consider some other options

Ive found that on the pc if you addfac someone into the followers faction they can become stewards so you should be able to make any other argonian a steward. Ive done this with Hroki and Sigurd xD

Oh sweet thanks! I'm gonna try that right away, I'll probably test it with a new npc I make in the CK. If it works I'll post to let people know

I wasn't able to get an Argonian steward from the vanilla game or by making an Argonian in the CK... I guess it's probably because they didn't record the voice acting for an argonian steward. Oh well, I got around it by hiring Marcurio as my steward and then turning him into an argonian with the creation kit. My dovahkiin prefers to mingle with his own kind.

That is a shame my second favorite race and they seem like they get shafted lol