I think Pablo's got it right.
I also share, as a starting point, the three-in-one view of a trinitarian God. In fact, I think the Holy Spirit is, frankly, the coolest of the three. I say this because he/she/it/other seems to be unbounded by time or space...as well as apparently, poly-lingual. [No small feat, considering my experience with German.
I think of the HS like those old cartoons of a little devil and a little angel appearing over our shoulders when we have an ethical or moral decision to make. The HS is (obviously) the angel -- our "better angel", telling us what we're supposed to do.
I said it was cartoon-ish.
As a[n armchair] genealogist, I see the HS as the ever-present and wise ancestor continuing to communicate and be relevant over all time. God is busy creating; the Son is busy being Jewish, old, and selfless...but something needs to be flitting about everywhere else. When I care about people who helped create me (and many, many others), I feel like I'm worshipping at their altar. Perhaps, then, the HS is the ultimate, the über-ancestor, who incorporates them all.
Haha...not Scripture by a long-shot, but my own silly musings.