Face on your face? Sure, why not. I used to do that with the Pebble watch years ago. There's now a Bitmjoji watch face for the and , which does exactly what you think it does: Your little avatar can hop onto your watch.
Fitbit says there are over 50 Bitmoji animations on the watch face that change to match goals and motivations (there's one with sleepwalking to remind you to sleep, a celebration one, a food-logging one, and they vary from day to night).
Of course, having your face on your watch face means it won't be as personally emotive (Bitmoji can be 3D on your phone, and AR Emoji and Memoji are animated by your face, which can't happen on a Fitbit Versa). But it's a really interesting idea for a more immediate motivational tool on a fitness watch.
The watch face connects via Snap to access the Bitmoji. I haven't had a chance to dive in and make my own face-face yet, but it's another cute/weird idea in Fitbit's watch face store.
If you're curious to try it out, dive right in.