Quick Note: all 6 players who have expressed interest in my DM'ing a prelude adventure to BG3, are also playing BG3 (they're friends of mine). I noticed all 6 are very interested in Gale's backstory (that's why and how I came up with this idea, without telling anyone anything, except that I wanted to DM an adventure). So, yeah it's a very specific situation. Not for everyone, obviously.
The difficulty I'm having is: how to keep the mystery and surprise going throughout the adventure, without the players going: "Dude, come oooon... is that supposed to be Gale? I KNEW it the moment you introduced the suspicious, charming, vain, arrogant human!" LOL
Right now, it's all too 'on the nose' and obvious. I'm trying to have it be a big reveal ONLY at the mid-point of the adventure.