Im roleplaying as servant of mora but im thinking of being a vampire does hermeaus mora dislike vampire s and molag bal or does he welcome them??

I'm pretty sure Hermeaus-Mora is one of the few Princes that is completely indifferent to the other Princes. He has no known rivalry with any of the Princes to date. So long as you bring him knowledge he wont care what you are or whom other you may also serve.

is molag bal indifferent to hermaues moraa?

Considering that Molag Bal is all about domination... he might be a tad pissed if HIS champion is used by another deadric prince.