the Juggernaut starts out with a higher amount of LP's and can have special traits, for instance, The ATK and DEF of all of his cards are increased by 500, or EVEN more for a harder duel. He could summon Two monsters per turn instead of 1. Draw 2 cards instead of one, certain types of cards won't affect him. The traits could even change for different Juggernauts. And of course, the Juggernaut can't refuse a duel.
And here's the fun part, after the Juggernauts taken out, the person who beat him becomes the new Juggernaut. And some traits could be traded out. The Juggernaut could choose from all the traits, and could have only 3 traits at 1 time and couldn't be traded out once they've been chosen.
They would also have to tell everyone the Deck they will be using, along with the traits. They could also choose a Pre-Created set of Traits already grouped together for instance:
Agile:
1.) Draw 2 cards
2.) Summon 2 Monsters
3.) Attack Twice in 1 Turn
or
Strength:
1.) Stronger Monsters
2.) Damage Dealt Doubled
3.) Attack Twice in 1 Turn
or
Armored:
1.) Damage Take Halved
2.) Card Effect Immunity
3.) Higher Life Points
List of possible Traits:
1.) Draw 2 cards
2.) Summon 2 monsters
3.) Higher Life Points
4.) Stronger Monsters
5.) Card Effect Immunity (Not all of them... that'd be WAY too OP)
6.) Attack twice per turn
7.) Damage Taken Halved
8.) Damage Dealt Doubled
Now ontop of getting those 3 nice traits, you have to pick from a set of weaknesses, you MUST choose at least 1
Possible Weaknesses:
Monsters in defense positions have half their defense (Or vice versa)
The Juggernaut has half the normal life points
The Juggernaut can only lay down one face down per turn.
The Juggernaut can't set monsters.
The Juggernaut can't attack directly
The Juggernaut's direct hits are 1/4 normal power.