We already have the romance option in game (thankfully) so improving it would be great! He and Omeelum are different compared to other mindflayers. It doesn't matter that he might be manipulative or even if people think he is evil, why would that be an issue? Some people would romance other (evil or not) NPCs so why not him? I would also love a romance with Omeelum (I mean, there is no confirmation he is with Blurg together right?)
I just see Omeelum and Blurg are just Co-Workers/Friends, maybe Blurg joined the Society to get better income for his wife and kids, while Omeelum has that grindset and is married to the job kind of thing.
I think someone in this post mentioned they were together but I haven't found any indication for that in game and not by googling either. But they aren't Larians own characters, they existed before from what I understand, so maybe someone can give some insight if they were supposed to be a couple or not.
Anyway, I just mean we see with Omeluum and the Emperor renegade mind flayers and they are awesome (in my opinion) and I am very glad we got the Emperor as romance option because I would have asked for that too.