As far as I know the producers said that they didn't think about the meaning of the single tarots, they just made some associations they thought were fine (Some of them really are, for example the tarrot "The Tower" which always means loss and something bad happening) and Bangel were "the Lovers" Spuffy were "the Demon".

Yeah, it kinda biased. Some shippers think that Dark Horse artists are Bangel. I hope that that's not totally true.