The Vampire Legacies 2 (Roblox) It's not unpopular perse, it's just niche and p2w p much. Still REALLY fun if u have robux tho, fun if you don't have it as well. Super chill, super toxic, the trifecta.

Now here's a super unpopular one, The Order (Show), never hear anyone talk about it and im not sure why, its a super good show on netflix! I'd 100% give it a watch if u dont mind supernatural stuff, vampires, werewolves, witches and allat. Super good!