I don't suppose you can ask him about who the entity really is? I know he didn't write the warrior storyline(like karpyshyn said when asked this), but Hood was a lead writer for the game as a whole, wasn't he?
The Entity that asks you to rescue Revan? It's the Jedi Exile, the PC from KotOR 2. Just as canonically Revan is male, canonically the Jedi Exile is female. If you do the "Jedi Prisoner" quest that is a sort of "container" quest for Taral V and Maelstrom, after you save Revan and you talk to him, one of the questions you can ask him is who she was, and he tells you. So, unless you think Revan is lying to you, there's no need to ask any devs, the game outright says it if you ask the right question to Revan.