What I know for sure, is that Myron stays with you if you're playing a bad character.
Vic stays with you too if I well remember.
If you're married with Miria or Davin, I guess your spouse stays with you.
Dogmeat from broken dreams certainly stays with you
The dumb cybernetic robot dog stays with you, but I'm not sure as regards the clever one.
Cassidy doesn't want, he says that he don't want to be sold when your chara will be short on money.
Sulik will try to kill you.
As regards Skynet, once I played an evil guy... so I went to Sierra and fixed the robot. Once it was fixed, I tried to speak to him but he said that he wanted to leave... so he followed me, and once we were out, he shot me in the back!
Marcus doesn't want to follow you.
Lenny neither.
I'm not sure for Goris, but I suppose he doesn't.
I hope I didn't say too many bullshits...
P.S : you should change your topic's name. 'cause your question is : "what NPC's want to stay with you as you're playing an evil character".