Weakest Person to take out a fully prepped Wonder Woman?

She gets everything she's been shown to use in the past.

Gauntlets of Atlas, magic sword, armor, etc.

Killer Croc

Karate Kid.

Here's my lists on who I think have the best chance of beating her period. (I'm going to assume you don't count cosmic entities)
DC
Emperor Joker
Soul Fire Darkseid
Blue Sun Superman
GL Ring wearing Doomsday (Maybe)
Berserk Superboy Prime

Marvel
King Thor
Silver Surfer with Carnage Symbiote (He did have it briefly)
Berserk Genesis-Vell
Thanos with Infinity Gauntlet
Thor in the Destroyer Armor (Maybe)

Correct me if you don't think anyone I listed can't bring Diana down.

Aqua Man

Originally posted by Prep-Man
Karate Kid.

Very possible. But I'm not sure if I'd give him the majority.

Superman!

What exactly has Karate Kid done?

this guy

😘

Thanos fully prepped.

I take it by fully prepped you mean the Infinity Gauntlet?

Originally posted by DarthDaniel1001
I take it by fully prepped you mean the Infinity Gauntlet?

And that's exactly why he's one of my favorite villains

Originally posted by DarthDaniel1001
And that's exactly why he's one of my favorite villains

He's one of the best if not the best. But not one of my favorites. I like Plot Villians Like Zoom, Juggeraut, DS. Villiasn with plot powers that just can't be beaten unless by Plot. Ultimate Destroyer. Thanos isn't a plot villain.

Batman

a chair and a rope

Surfer having the symbiote should make him weaker.

Originally posted by Mindset
Batman

😐

WW = same result

Originally posted by TheKahn
😐

WW = same result