I think based on how last season ended and the few spoilers we’ve seen, Nick is going to be maintaining a delicate balance between providing a normal life for his kid and going all aggro-grimm. How WELL he will maintain these two things remains to be seen.
All indications point to Nick going to a pretty dark place this season. But he has Monroe and Rosalee, Renard, Wu, Hank, and Bud to pull him back/comfort him/smack some sense into him, so I hope in the end he’ll be okay.