I’ve made a rogue/cleric type. Here’s the idea; a vampire, but the strain is so shallowed out the creature is unliving instead of undead. So it is not affected by turning undead, holy water, etc. It doesn’t heal naturally, but must drink blood to live. Its blood can heal a human, too. So you’ve got a party healer through drinking blood instead of touching and casting.
I think this is pretty cool.