Hey ZM5! If you are doing caster/secrets I have an two ideas:
1.
Hamon:
Hamon is a ancient martial art that relies on the user's breathe to produce a 'ripple' inside their body. It's extremely powerful against undead (Vampires, zombies, etc.) creatures, being able to obliterate them in a single punch if they are weak enough. But of course that isn't its only use as it has other abilities that affects objects, normal people, metals, and more.
For a more in-depth look on Hamon, here is a wiki page on it:
I have attempted to create a representation of Hamon before, it really didn't work out that well but I did have some ideas such as Ripple Hypnosis boosting an ally's strength, a basic ''''''''''''''Material Emission'''''''''''''' where the Hamon User would launch a series of rapid punches at the enemy (the punches would cause a deadly syndrome that would destroy undead in seconds due to rapid necrosis, or a different effect if it was a different type of barrage such as paralysis, swelling Fist of the North Star style, etc.), a Ripple Cutter that would let the Hamon User spit out sharp blades of spittle at the enemy, and lastly Hamon Breathing which would temporarily boost the User's strength and agility (very short duration but the User could use it again in a similarly short amount of time).
If you so wish I can link you a download to that version I made, it's really basic though (another reason it flopped) so be warned.
2.
Spin:
Spin an alternate universe version of Hamon where instead of their power coming from breathing Spin uses the rotation and acceleration of objects to launch things such as balls, bullets, and even dirt.
Of course, as with Hamon, Spin can be used for a multitude of purposes besides attacking such as controlling the muscles of others, increasing the sturdiness of the body, the ability to partially control their projectiles, and more.
I have barely started Part 7 of JoJo so most of my info comes from the wiki page:
Also, I didn't say Stands because that would just be impossible in current Dwarf Fortress, well... maybe until the magic update is released at least (whenever that'll be).
Edit: Forgot to mention that Hamon Users and Spin Users are still mortal, but Hamon does extend the user's life expectancy by quite a few years. Another thing about Hamon is that if the user loses their ability to breathe they won't be able to use any of their abilities, so being able to breathe is a requirement.