I pick Michael Demiurgos from DC. He uses his sword on multiple occasions.
@CerusSerenade: That wasn't aimed at you but everyone in general.
He had DEMONICA upgrades and many of those end game "swords" and "guns" are divine/mythological weapons. Not to mention that he's already pretty much multiversal at that point so no I wouldn't term that as being "skilled".
"Skill" is someone like Fake Assassin who was able to create a technique like Tsubame Gaeashi just by practice alone.
@ReiKai: Well Omnimon X can end the universe with his sword so I'd say that's an impressive sword skill. And I suppose this doesn't count but for Alphamon, "In battle, it possesses the ability for the ultimate force which instantaneously replays the battle's past, so although Alphamon's attack are over in just an instant, you can't grasp how many attacks it actually unleashed, and in theory, you can only see the final blow that brought down the opponent."
^I'd certainly have contested that but it seems there's no reason to as OP himself has given a relaxation in the last 2 or so pages and given victories to characters who lack skill with a sword but make it up with hax and power in which case both your's and UltimateHero's choices are totally valid.
Carry on people.
If the character has actual skill and training with a sword and acquires hax abilities
What makes their skill superior to D who as you yourself have listed can accomplish insane shit with just a regular sword? Do their swords possess special properties/grant special properties or are they just plain regular swords?
Concerning "hax" abilities, is everything allowed or just sword based hax?
"D" has at least 5000yrs experience with skill and ability to completely ignore 3-dimensional laws, and cut through materials stated as nigh-indestructible to completely indestructible, using only a steel sword that possessed no special properties of its own.
You are dismissing everything as not being in D's league but can your two choices accomplish shit like that with no outside power, no special abilities, weapons with nothing special about them whatsoever and just purely based on skill?
Or have I misread your intentions and you are just looking for a skilled swordsman who can defeat D not necessarily exceeding the shit he has displayed? In which case, yeah, I see there being many potential candidates who can beat him.
You need to clarify this.