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Oz - Buffy the Vampire Slayer - was created in 1997.
Master - Buffy the Vampire Slayer - was created in 1997.
As You Were - Buffy the Vampire Slayer - was created on 2002-02-26.
Faith - Buffy the Vampire Slayer - was created in 1998.
Satsu - Buffy the Vampire Slayer - was created in 2007.