3 accounts (first tried 2, got bored) , one PC, using Keyclone and Jamba.

Illidan (US)
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Nekroraep & Nekroreap - Warlocks, level 55
Nekrodamus & Nekrofucious - Death Knights, level 61
Lullacry, Arkona, & Aghora - Hunter, Warlock, Priest, level 47ish
Steàlth, Stêälth, & Stèàlth - Rogues, level 36 (honestly, not sure about the special characters, but I think that's it....)
Notäshämmy, Notäshammy, & Notashämmy - Shaman, level 7 xP

Haomarus (US)
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Nekroraep - Warlock, level 80
Gimmeyomoney - Rogue, level 71
Xaos & Xaosia - Rogues, level 38 ( I think )

Magtheridon (US)
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Nekrodamus & Nekrofucius - Death Knights, level 55