Lets see:
From the top:
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Blades:
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Aquarius with 6 melee.
It has innate freeze for melee. Now just get 1 combo in for a large freeze chance and finish off opponent with 1 more free combo.
Crusader Blade:
6 Range
[Forward] Dash Ch. Shot +2 or higher
1 hit kills
Samurai Blade
Melee: 6
Dash Melee boost
1 hit kill everything
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Staves:
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Flintlock: At 3 stars or higher, kills with energy charge at 50 range or more.
at 6 stars, and standing or forward dash ch+4, it will kill anywhere on the screen.
Lancer:
6 range
shot homing boost
Huge damage, awesome homing. 2 shot kill
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Claws
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Brawler
Speed + 3 or 4
Stamina +3 or 4
Now just run around laying mines or using attack panels for damage supporting your LvD team without ever dying.
Viridi Claws
Melee: 5 or 6
Melee Combo Boost
1 combo kill anything and everything
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Bows
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Phosphora
Range: any
This thing doesn't even require aim. You are almost guarenteed a hit.
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Palm
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Great Reaper
Range: Any
Shot Homing Boost
Shot Range boost
3 hits, 1 charge shot.
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Club
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Babel
Range: 3 or higher
Standing Ch Boost
Innate Slipshot, multihit, if you have a status ability, you can screw over anyone.
Ogre:
Melee: 3 or higher
Melee Dash attack +4
1 hit kill anything and everything
Black Club:
Range: any
Shot Range
Shot Homing
Standing Ch. Bost
Innate Slipshot, nice homing, good range.
Magnus Club:
Range: 6
Backward Dash Ch. Shot Boost
Shot Cancellation Boost
Now you have an impenetrable wall and it can instant kill.
Not even gonna bother with the rest. I know im missing some pretty messed up sets.