The 8th conspirator that was absolutely pro-death was Trebonius.

We can also assume that there were some senators in favor of the plot. Publius stops the men on their way to the Capitol to wish that their enterprise may thrive today.

Other higher ranking personnel didn't trust Caesar either. Flavius and Marullus speak against JC in Act 1.1 as the play opens.

We can also assume that there were plenty of commoners that still loved Caesar as well. An example of this is Artimidorus going out of his way to write and attempt to deliver a letter to Caesar warning him of his impending doom.