Dreadblade

Looks good with http://wowhead.com/?item=25147, although you'll probably never get them both at the same time

With the addition of Transmogging, I use this alongside my hanzo sword =]

If you're going for appearance, here is a list of daggers and swords with that Japanese look and their respective handle colors:

[u]Daggers[/u]: [item=10625] Black handle: Very low random drop from Sunken Temple mobs [item=1935] Blue handle, random drop primarily in regular Shadowfang Keep; also drops from pick-pocketed boxes from level 20-ish mobs [item=25306] Blue handle, random Outland world drop [item=5756] Brownish handle: Very low random drop from Scarlet Monastery mobs [item=4088] Brown handle, random world drop from level 40-50 quest zones/dungeons [item=57492] Brown handle; Horde quest reward from [quest=26063] in Stonetalon Mountains [item=53300] Blue handle; Alliance quest reward from [quest=25153] in Southern Barrens

[u]Swords[/u] (one handed): [item=23540] from [item=23629] -- sits on your back instead of hip [item=12535] Black handle: Very low random drop from Blackrock Depths or [npc=9026] who guards the entrance [item=8190] Black handle: Very low random world drop from mobs in level 50-60 quest zones and dungeons in Azeroth [item=15216] Silver with black patterns; random drop from level 48-53 mobs [item=7943] Black handle, from a blacksmithing pattern: [item=8029] [item=13036] Green handle: low random world drop from mobs in level 50-60 quest zones and dungeons in Azeroth [item=9718] Green handle; Very difficult to get; involves rare drops and such; it's too complicated to summarize quickly. [item=9424] Green handle; Low random drop from mobs in Uldaman -- sits on your back instead of hip [item=25147] Brown handle, random drop from Outlands. [item=13953] Brown handle, [s]drop from [npc=1853] in scholomance EDIT: No longer drops in game. [/s] EDIT 2: There is a way to get this now thanks to Hegs' comment. See here: [url=https://www.wowhead.com/news/how-to-enter-old-scholomance-farm-once-removed-transmog-items-333981]Link to Old Scholomance attunement article[/url] [item=17054] Blue handle, 0.02% drop from a rare mob in Azshara, [npc=6650] [item=53256] Blue handle, Horde quest reward from [quest=24637] in Southern Barrens [item=67214] Red handle, quest reward from [quest=28628] in Winterspring [item=60702] Red handle, Alliance quest reward from [quest=26520] in Redridge Mountains [item=53280] Wood sword, Alliance quest reward from [quest=25108] in Southern Barrens

[u]Swords[/u] (two handed): [item=2205] Black handle; very rare world drop from Shadowfang Keep; debate as to whether this still drops [item=2801] Brownish handle; Very low drop rate from vanilla raid mobs [item=9385] Brown handle; random drop mostly from level 32-38 mobs [item=6909] Brown and green; 30% drop from [npc=4829] in Blackfathom Deeps [item=2822] Wood sword, the mob that drops it is no longer in the game, so it is a rare one to have. [item=16039] Purple/gold; [s]dropped by rare mob Lord Darkscythe in Eastern Plaguelands[/s] EDIT: No longer drops in game. [item=5813] Reddish/pink handle; Alliance quest reward from [quest=26472] [item=15251] Green/blue-black; world drop; mainly off 39-45 level mobs, (some level deviation for instances). [item=3854] Silver/gold handle; taught by [item=3868], dropped primarily by level 35-45 mobs. [item=10573] Gold handle; rare drop from Razorfen Downs [item=15257] Blue handle; random drop mainly from the old vanilla raids [item=25987] Blue handle; quest reward from [quest=10255] in Hellfire Peninsula

As of patch 10.1.5, [item=13953] is now obtainable again after doing the attunement quest to grant access to Old Scholomance: [url=https://www.wowhead.com/news/how-to-enter-old-scholomance-farm-once-removed-transmog-items-333981]Link to the news article explaining the attunement[/url]

This dropped off a [url=https://wowhead.com/npc=7246]Sandfury Shadowhunter[/url] after 2 runs of Zul'Farrak. Good luck!

[b]Edit Update:[/b]

[b][u]Zones[/u][/b]

[b]Searing Gorge[/b] - [url=https://wowhead.com/npc=5839]Dark Iron Geologist[/url], 2 kills

[b]Tanaris[/b] - [url=https://www.wowhead.com/npc=44569]Sand Lasher[/url], 37 kills - [url=https://wowhead.com/npc=40632]Southsea Musketeer[/url], 377 kills

[b][u]Dungeons/Raids[/u][/b]

[b]Stratholme[/b] - [url=https://wowhead.com/item=16052]Shrieking Banshee[/url], 29 runs - [url=https://wowhead.com/npc=10400]Thuzadin Necromancer[/url], 23 runs

[b]Zul'Farrak[/b] - [url=https://wowhead.com/npc=7273]Gahz'rilla[/url] (Boss), 15 runs - [url=https://wowhead.com/npc=7246]Sandfury Shadowhunter[/url], 2 runs - [url=https://wowhead.com/npc=7269]Scarab[/url], 19 runs