Sigh. Spelunky's March 12th daily challenge on PC:
Had 12+ health again too thanks to the invigoration buff, much like yesterday...
There's an indication that tells you which one's real or not. If the damsel is real, it'll take 8 seconds per help cry / dog yelp. If it's a succubus, 4 seconds.
Not that it really matters since you've already unlocked her, so this is aimed at anyone anyone else not certain about the criteria for specific characters. There's one of each per world and that's excluding the likes of the Golden Buddha / Monk or Yang where you need to reach a specific stage or finish the game via one of two endings.