malifer Closer to RuneQuest I reckon. It's still BRP at its core. Off the top of my head, I think your hit-points doubled, Luck is regulary refreshed and if you have 30 to spare, you may escape any otherwise lethal consequence. There's also skills and talents of a pulpier texture: weird science gear, clairvoyance, trick shooting...
How We Roll Podcast have an ongoing AP of The Two-Headed Serpent, and the first few episodes might be an excellent primer on what kind of tone and content is achievable 😄