Piercing DD - Please note this test took place on Piercing weak enemies, rather all of these DD have piercing as their damage or not I can't say, but all of them use piercing weapons.
NanaaMihgo:125DPS~130DPS - crazy melee dps/attack speed. Good to okay WS numbers. If she uses Wasp sting it can suck and die, but her DE and Cobra moves are solid.
Lehko:81 DPS - All his WS do about 1400-1600 dmg, very fast melee attack speed. Has a nice AoE cure/erase ability.
Elivira :73 DPS - Her melee hits are quite powerful, keep her in range and use haste over flurry if you use her. Her DPS would probably be substantially higher if she wouldn't stand at range.
Excenmille:68DPS - Tanks/Sentinel, Penta Thrust is powerful.
Lion:62DPS - Decent Melee DPS and WS output, nothing remarkable.
Slashing DD
Tenzen: 88 DPS - Good melee and WS numbers.
Noillurie: 84DPS - Combined TP/Skillchain - Probably be higher on the list if she were alone and could WS freely off herself.
Ayame:82DPS - Shes great. Will use a WS to make highest possible Skillchain with your last used weaponskill.
Lhu Mhakaracca:78DPS - Good melee fighter, her WS do decent damage, uses Berserk, noting special otherwise.
Romaa Mihgo: 78DPS - Good melee fighter. Will TA/SA if lined up, Aura-Steel has high rate of absorb, uses Feint.
Iron Eater:77 DPS - Good strong melee hits, decent WS damage, uses too many "Break" WS and not enough Full break/Good Gaxe WS.
Volker:70 DPS - Good WS damage, uses lots of JA (Defender, Voke, Retalation, Warrior's Charge, Warcry, berserk)
Naji:62 DPS - Tries to tank, kinda meh.
Gessho:60DPS - good WS output, good melee hits, too much Ninjutsu. Uses Yonin.
Blunt DD
Mumor:85 DPS - meh melee damage, high WS numbers, Haste samba.
NajaSalaheem:60~80DPS. Crap melee output, Hexastrike has high numbers.
Uka:44DPS - Uses Waltzes and such, Im sure this is why her DPS sucks, to balance that.
Hand-To-Hand DD
Prishe:65DPS - Good for back up curing potential.
Maat:63DPS - Just a melee fighter. Howling fist hits hard.