These are the ones I've found as well. Don't think there's anymore than those though... unless... I think I heard there was another Nord from Skaal Village but that might be wrong.
I was wondering... out of these new followers, which ones are more 'fun' to have around? As in make comments etc?
Well, everyone seems to like the guy from Raven Rock hireling the most. He has a lot of funny comments in general, plus he has unique dialogue when you bring him around different places in Skyrim.
If you're doing the actual main quest though, Frea is a great one to keep around even after you don't need her. She actually has some interactions with other people in the questline.
Like, Neloth got done talking about the Dwemer constructing those ruins, and then she said "It's hard to believe they built all this". She did that before too when he was explaining things. Not sure if the other ones do anything like that though.
=/
The other ones are typical boring followers.
I wish the Thirsk Hall Nords were followers though.
;_;