I wish to thank everyone for answering. So the answer seems to be that there are no official entities of that sort, but there are powerful beings in these realms that take on some of the function. I guess I will have to create my own entities.
The reason I asked this question was two-fold. I am interested in incorporating such entities into my own campaign, but the reason I thought of it in the first place was that the Cosmic Mage (Destrel Schwarzschaf) I play in a PbP campaign - The Gatemaster (http://www.dndonlinegames.com/index.php?name=PNphpBB2&file=viewtopic&t=969&start=230 [BTW: It is an excellent PbP site if any of you wish to run or play in PbP games]) needed to contact the 'Lord of [the Plane of] Shadow' to learn some very difficult to obtain secret lore that very much ties in with 'shadow'. The high-level game is begins in a homebrew world called Avalon, but uses the official/Planescape D&D cosmology and even links to other planes. Anyway, I 'fudged' it (with DM approval, of course) and 'created' Hykisch - the Emperor of Shadow..., but it would have been nice to have had something official.
Now, back to my own campaign... I will use Hykisch there too, but I have little (no) experience creating stats for such cosmic entities. Has anybody created (or is currently working on) something of the sort that I could 'plagiarize' for stats?
The reason I asked this question was two-fold. I am interested in incorporating such entities into my own campaign, but the reason I thought of it in the first place was that the Cosmic Mage (Destrel Schwarzschaf) I play in a PbP campaign - The Gatemaster (http://www.dndonlinegames.com/index.php?name=PNphpBB2&file=viewtopic&t=969&start=230 [BTW: It is an excellent PbP site if any of you wish to run or play in PbP games]) needed to contact the 'Lord of [the Plane of] Shadow' to learn some very difficult to obtain secret lore that very much ties in with 'shadow'. The high-level game is begins in a homebrew world called Avalon, but uses the official/Planescape D&D cosmology and even links to other planes. Anyway, I 'fudged' it (with DM approval, of course) and 'created' Hykisch - the Emperor of Shadow..., but it would have been nice to have had something official.
Now, back to my own campaign... I will use Hykisch there too, but I have little (no) experience creating stats for such cosmic entities. Has anybody created (or is currently working on) something of the sort that I could 'plagiarize' for stats?