Everything that has been shown regarding the angles indicate a few things.Except he is not at all... He is pro-superior race.
a) Varis absolutely loathes the notion that the Ascians are pulling the empire strings, as is understandable. He is a puppet-leader and this aggravates him no end. He's so fervently behind the empire that the fact Solus' 'timely demise', which threw its own leadership into question, didn't even register on Varis' radar as having been planned just for the sake of 'moar chaos'. Ascians may have built the empire to 'sow the seeds of chaos', but Varis didn't even imagine that said goal would also apply to the empire itself. It is not exempt from receiving the treatment it was created for. Varis absolutely hated this.
b) His attention towards Black Rose (after Gaius' sabotage); In essence, if it stops the needless deaths of his troops then there is 'no method I would not employ'. Despite the implications of him continuing production on what can be compared to the likes of nuclear weapons in our time, it is also implied that he's only really doing it to placate Solus/Elidibus constant demand for Varis to, you know, DO something, and that it would save his men more trouble than it's worth.
c) We can only assume (for now) that he genuinely meant what was said at the negotiating table. I'm not buying it at all - at least not 100%. He clearly wants the Ascians out of his hair and may very well be taking his pro-human aspect to the next level, but there are some (like me) who believe it to be a bit of a bluff and playing up to his puppet-leadership, and others who seem to think that Varis is under Solus control somehow. I've not seen any indication of the latter and am under no illusions that Varis, for the most part, is a big-bad no matter which way you cut it, but I most definitely do suspect that at some point down the line, Varis will betray Solus/Ascians, likely with the sabotage of the 'spare bodies' he prepared.
I've not seen much to indicate pro-superior-race other than the 'rejoining' goal, which again, we'll have to wait and see - until then, I stand by him being pro-human until we see for certain how things pan out and whether he genuinely is fully behind the concept of merging all the things for the sake of a potential master-race. I hope not, because not only is that a bit of a tired trope, but also seems completely stupid to me. There is no indication at all that having such a thing happen would make said race 100% happy to align with itself just because the imperfections are flattened out, and certainly doesn't guarantee he'd be the leader in any way -- assuming there is even anything left to lead afterward.