I don't know many thinks about him. I'm Christian. It's the bible that teaches us his the most evil but i'm kind of skeptik so here's what i believe. God created everything and all Angels, his favorite of all Lucifer, then he created humans and said bow in front of us, Michael was the first but Lucifer denyed saying that they (angels) were greater than the humans and that they should bow instaid. I don't know but i agree with him at that.
Now, i guess i'm too kind prohaps but i'd like to believe his not that evil, that he had a point, i don't believe that i'm greater than him and the others, angels and demons are extrodinary beings we stand no chance in front of them.
That's what i believe, that his not so bad, but, he fell because of us didn't he? So he has the right to be mad and he is like you said from your expirience with that ring, the only feelings he has are hatred. I'd discribe him, as the "King" of all demons the most stuborn (no offence) he wants to have things his way, that why when someone was against you he hated them. Cause they were against his will. Go on google and search for demonology or angels and demons, articals, i had found a site that was amazing and explained everything the bible says, the createor as well said his opinion, that where i formed mine above, but i lost the link. I'm sorry if i offented you or your reliegion in any way, i'm just trying to help and understand at the same time what happened. If you like PM me about links to sites like this, they might help. ^_^