Is there a "good" consciousness? I wondered if there was a consciousness that underwent nirvana? Is there a consciousness of nirvana? Is there a consciousness that creates either of these consciousnesses?

I would call that the "good" consciousness, like the good guy in the movies. i.e. salvific.
I wondered if there was a consciousness that underwent nirvana? 


According to the Theravada abhidhamma, yes, it is called a lokuttara-citta, and it is beautiful (sobhana).


  Is there a consciousness of nirvana? 


This wording is a bit more difficult to answer. Since nirvana entails unbinding of consciousness, it is hard to describe it as being conscious of anything. Still, technically the mind is said to take nirvana as an object; it is probably better phrased as "object of focus", as in "the mind is focussed on/in unbinding", rather than "the mind is conscious of nirvana" - the latter is a bit of an oxymoron, I think.


  Is there a consciousness that creates either of these consciousnesses?


"creates" is a bit problematic. lokuttara minds are said to be unconditioned, yet there is clearly a process that leads to them, and that process clearly involves certain specific minds - namely, the mind that realizes the first and second noble truths.  There is a consciousness that is necessary for the attainment of nirvana; I don't think this exactly means that said consciousness "creates" the nirvana consciousness. It is all very technical. In practice, nirvana is the unbinding, so any talk of creation and arising is very much out of place.