I'm wondering about adding some mild super powers to fighting in Dwarf Fortress.
Advanced Techniques - Dwarves can gain advanced maneuvers by practicing a lot. A civilian might throw a sloppy punch that can land anywhere, a trained grappler can land a skull-shattering blow to the temple. Striking, grappling and weapon attacks could all benefit. I know that's mostly how it works already, but I think there's room to add a little more flair. Knee strikes, head butts, neck chops, disarming strikes, pressure point blows. These could even be cultural, i.e. Dwarf Thai use knee strikes, while Dwarf Japanese use karate chops, etc.
Training Machines - Punching bags, mechanical moving targets, weights to lift, etc. Would need to be balanced against sparring, for example, training machines could require a lot of expensive parts, but increase the training more than sparring, or machines could improve base stats, strength, agility, toughness, while sparring improves technique, sword skill, armor skill, etc.
Berzerking - Like the Martial Trance or Prone to Rage, but something you train you to do. A dabbling Rager can rage 2% of the time, a Legendary Rager can rage 100% of the time and get better benefits to raging. Maybe something that dwarves can only discover "by accident", for example, there's no way to train to rage until your dwarf enters a Martial Trance in combat, but after that, the dwarf can try to do it on purpose and teach others to do it.
Enchanted Weapons - Artifact weapons could have more elaborate bonuses. Myth, fantasy and video game are filled with ideas: swords that flame, staffs that grow, throwing weapons that magically return, weapons that fight on their own, and so forth. I think a lot of players express disappointment when their blacksmith makes an artifact lay pewter axe or something like that and it's not even as good as goblinite. Besides producing them yourself, invaders could occasionally bring enchanted weapons, either handed down by gods and demons, or stolen from other civs. If the tavern upgrade brings heroes to your fortress, extra heroic weapons could bring enchanted weapons with them. Weapons could also gain their enchantments after creation, but I'm not sure how. Maybe the religion system could be one source.
Rare Genius - The idea that certain individuals are natural geniuses who can unlock a full potential that no one else can touch. Son Goku, Chuck Norris, HollisticDetective, etc. These geniuses are well beyond the physical capabilities of other dwarfs. They are one-dwarf-armies, capable of beating down an entire siege single-handed, ripping out the heart of a forgotten beast or suplexing a bronze colossus. The genius cannot be taught, nor can they teach what they do to non-geniuses, it just comes naturally to them.
Ancient Master - The opposite of a genius, the ancient master has gained knowledge through years, maybe centuries, of study and training. He can teach others, though they must dedicate themselves and train as hard for as long as the ancient master has to get to the same level. Among other benefits, masters could unlock a bodily secret that prevents them from aging, so that they can keep studying beyond a normal lifespan. i.e. Master Roshi from DBZ is like 700 years old. Besides people as masters, there could be fighting manuals or ancient scrolls that instruct new warriors.
Ninja - Warriors with intense training or the necessary gadgets can perform feats like climbing walls, jumping huge distances, walking on water, using camouflage, etc. Rare Geniuses and Ancient Masters might be able to go farther, pass through walls, become invisible, fly, breath water, etc.
Qigong - The apparently totally for real kung fu technique of temporarily hardening your body to deflect wounds:
https://www.youtube.com/watch?v=7iwyTJuDGiA In Dwarf Fortress, this might give martial artists the ability to turn their tissues into stone, bronze or steel, at the instant an attack connects.
Auras - A staple of eastern martial arts, the idea that sufficiently trained martial artists can detect powerful or evil auras from other martial artists. In some interpretations, auras are an extension of animal danger instinct, the ability to detect that something is capable of doing you harm. Martial artist can sharpen this danger sense to get more information out of it, physical or mental or spiritual training increases someone's danger level, aura specialists can hide their auras to avoid detection or heighten their auras to psyche out strong opponents or completely avoid weaker ones.
This -
https://www.youtube.com/watch?v=7iwyTJuDGiAEDIT: 4/26: Added some things.