I would like it to have a few super fast moves, like Shao Kahn's swinging mallet attack in Shaolin Monks for instance. An Iron Knuckle can be a boss, but call it an Iron Fist. He/She will have multiple horizontal swing attacks, multiple vertical (swinging down at Link) swing attacks, and a combination of both. It will charge, retreat sometimes, it will be so much faster in general. Also, his axe can act as a boomerang, ala Castlevania LOI Axe+Blue Orb attack. He can jump up and slam into the ground causing you to auto pause and get dizzy if you yourself are not in mid air.
When you hurt him enough, there will be a cutscene where you slash his axe into half. He will throw it away and Part 2 of the battle begins. He will use hand to hand combat from now on. Eventually as you chip away at him, parts of his armor falls off, but this will only make him faster since he has less weight to carry. This allows him to be more acrobatic with his attacks. When all of his armor falls off, he will be the speediest mother****** around. This is the final part of the battle. You can't hit him with your sword or even with arrows as you target him. He will just be too fast. The only option for you is to sit tight and let him come to you. Only then can you find a precise moment to damage him.
A cutscene will commence. However, instead of him being on the receiving end of the final blow, he somehow trips you/catches your sword, and takes it away from you. He is so pissed off that instead of using it, he chucks it away in the corner of the room. Now comes the surprise, you have to fight him with your own hands! Use the same strategy, let him come to you. When he retreats to pause for a second, you can bum rush him and succesfully nail him a few times. There will come a point when he won't even charge at you anymore, now you have to go to him, he is much slower.
After enough hits, the final cutscene will occur. Link knocks him almost unconscious. You are both bloody, bruised, and tired. Link calls for the Master Sword, and it flies right back to him. This is a normal move by the way, the new game will have enemies knock your sword out of your hands, and you can retrieve it this way. Link with both hands raises his sword into the air and stabs it into the Iron Fist on the ground, much like how Link puts the Master Sword to Rest in
OoT. The Boss explodes, Link is still kneeling with his hands on the sword. End Boss Fight.