I was going to suggest jean J.M Jarre, but hard to get the ambience of Bladerunner as its quite curated.

But as an aside, there was these synthesizer compilations in the late 80s / early 90s that introduced to my to a bunch of Synth artists. Most of them have quite a range of styles they do on synth, some quite bladerunnerish (including Vangelis). Anyways, the albums are "Synthesizer Greatest 1,2 and 3". Spotify has them as a playlists, as do most other music providers.

EDIT: also The prime thanatos streaming on Youtube https://www.youtube.com/watch?v=9P23oE6ekwQ

I fell in love with Tomita's classical reproductions as a child. His sound textures took about 25 years for anyone else to come close. Crazy to think that he played almost every part on his keyboard. All he had were early analog sequencers, and had to multi-track everything because polyphonic sound had not yet been created. If you haven't heard, listen to his take on Pacific 231 by Honegger. https://www.youtube.com/watch?v=hjxbwZG20Wc

Nothing against Vangelis of course...

I saw Jarre live in the London Docklands in 1988 - I was a poor student that lived within walking distance (Woolwich) The rain gave it an ambiance that worked, and the location was abandoned industrial location - now redeveloped

The difference between London in the mid 80s to now is stark, but it’s not quite fully Bladerunner

I was in that, on stage! :-)

I remember every detail... even the smell of the diesel generators. And the very-wet synthesizers (it was pouring with rain!), and - carefully edited out of the videos - the different tracks that veered out of sync, seemingly heading for disaster...