I've been planning for Gloom Stalker since it was announced it'd be in the game and will not stray from that for my first playthrough. Not sure if it's for everyone, but to me it seems a *lot* of fun, especially for a first run, as the Gloomy is good at exploration and finding those hidden doors!
i can just imagine a Gloomstalker, going into some interior space lit only by torches, extinguishing them, then running around like an invisible ghost killing everything without having to bonus action hide.