Lucifer is seen this way by many, but as you (perhaps) imply, yeah, there’s no right answer – we’re all just humans trying to understand things beyond our material understanding, so perceptions vary. A lot. If there’s one thing in common with all demonolatrists, it’s that they can’t agree on anything. 
My bible studies aren’t thorough (between being exposed to Anglicanism as a child and whatever I’ve studied out of curiosity since), but I was taught that Lucifer was a fallen (arch) angel. Since studying demons, a la demonolatry, I’ve learnt that all the ranked demons were once angels. For example, some see Belial as having been the angel that was Lucifer’s most loyal when they were still in heaven.
For example, here’s an excerpt from Introduction to Demonic Magick:
Luciferians believe that Lucifer co-created with the Abrahamic “God”, all that exists. We believe that it was Lucifer who was determined to be the Light Bearer for humanity. We believe that his determination to protect mankind’s free will and refusal to allow humans as puppets caused the grand separation of the Abrahamic God and Lucifer.
It goes on to add:
People forget that Lucifer was also technically an Angel and did not lose his moral code.
Now, of course, popular culture doesn’t represent truth either, but it does give an idea of what the societal norm is. In the USA-influenced world, there are many references to Lucifer as the king of hell, Satan himself, and so on. From movies like Constantine, The Ninth Gate, and The Devil’s Advocate, to TV series like Supernatural, Chilling Adventures of Sabrina, and Lucifer (some more, Devil in the arts and popular culture - Wikipedia). Many of them make him out to be really evil, but in more recent times, they’re starting to depict him as being misunderstood more and more. For example, Lucifer in Lucifer is mostly a decent guy that has a real chip on his shoulder about all this slandering by humans, while Lucifer in Sabrina is ultimately shown to be a caring father who does what he feels is right but does some kind of nasty stuff along the way.
Overall, it’s kind of in part due to Lucifer’s misunderstanding by the majority that I am drawn to supporting him as a demon. That being said, my patron is firstly Hekate, and then I keep close ties with Lilith. I don’t know how to put my perspective on Lucifer himself into words yet, other than to say that there is a lot of respect. But there is time yet for me to figure all of this out for myself.