This is a basic list of my experience across various RPG formats. For a detailed and linked list, please see my in-depth character listing.
RPG: Novus - novus @ insanejournal
TYPE: Harry Potter - Rebirth
CHARACTERS: Lucius Malfoy
RPG: Parabolical - parabolical @ insanejournal
TYPE: Multifandom - Buffy/Angel 'verse
CHARACTERS: Jareth (Labyrinth)
RPG: House of Gaunt - houseofgaunt @ insanejournal
TYPE: Harry Potter - Extreme Future, Time-travel
CHARACTERS: Lucius Malfoy
RPG: Fairly Tales - fairlytalesrpg @ livejournal
TYPE: Reincarnation - Fairy Tale
CHARACTERS: Phillip Cordon [Puss in Boots]
RPG: Hexed Private - hexedprivate @ insanejournal
TYPE: Harry Potter - Post Hogwarts, DH AU
CHARACTERS: Lucius Malfoy
RPG: All Roads - all_roads @ insanejournal (previously @ greatestjournal)
TYPE: Harry Potter - Post Hogwarts
CHARACTERS: Rabastan Lestrange, Daphne Greengrass, Barnabas "Alex" Cuffe, Regulus Black, Bellatrix Black Lestrange, Dominic Abbott, Ernie Macmillan, Gideon Prewett, Elijah Cuffe, various NPCs
RPG: Accersitus - accersitus @ insanejournal (previously @ greatestjournal)
TYPE: Harry Potter - Multi-Era AU
CHARACTERS: Rabastan Lestrange, Bellatrix Black, Alexander "Xander" Lestrange, Cygnus Black
RPG: Total Mindfuck - totzmindfuckrpg @ greatestjournal
TYPE: Harry Potter - Founders Era AU
CHARACTERS: Rabastan Lestrange
RPG: New Day Rising - new_day_rising @ greatestjournal
TYPE: Harry Potter - Post Hogwarts
CHARACTERS: Rabastan Lestrange, Daphne Greengrass, Barnabas "Alex" Cuffe, Regulus Black, Bellatrix Black Lestrange, Dominic Abbott, Ernie Macmillan
RPG: Changed Lives - changedlivesrpg @ greatestjournal
TYPE: Harry Potter - MWPP-era AU
CHARACTERS: Rabastan Lestrange, Gideon Prewett
RPG: Marauders Era - marauders_era @ greatestjournal
TYPE: Harry Potter - MWPP-era
CHARACTERS: Rabastan Lestrange
RPG: Hogwarts Hocus - hogwarts_hocus @ livejournal
TYPE: Multifandom
CHARACTERS: Lucius Malfoy, Maureen (RENT), Elphaba Thropp (Wicked MV)
RPG: Pulled Away - pulledaway @ greatestjournal
TYPE: Multifandom
CHARACTERS: Elphaba Thropp (Wicked BV), Kingsley Shacklebolt
RPG: His Era - his_era @ greatestjournal
TYPE: Harry Potter - Trio-era
CHARACTERS: Kingsley Shacklebolt
RPG: Moonlight - moonlight @ greatestjournal
TYPE: Harry Potter - Post Hogwarts
CHARACTERS: Rabastan Lestrange, Alex Cuffe
RPG: From Childhood's Hour - childshour @ greatestjournal
TYPE: Harry Potter - MWPP-era
CHARACTERS: Rabastan Lestrange, Gideon Prewett, Liam Prewett
RPG: Heir Apparent - heir_apparent @ greatestjournal
TYPE: Harry Potter - AU, "Trio"-era
CHARACTERS: Lucius Malfoy
RPG: Merlinsaid - A Hogwarts School of Witchcraft and Wizardry Proboards Forum
TYPE: Harry Potter - various Trio-era situations
CHARACTERS: Gideon Prewett (as Wyatt Alexander)
RPG: Ongoing private RP
TYPE: Harry Potter - various, Multifandom
HP CHARACTERS: Lucius Malfoy, Harry Potter, Abraxas Malfoy, Gideon Prewett, Remus Lupin, Rabastan Lestrange, Ginny Weasley, Liam Prewett, Voldemort, Tristan Bradley, multiple partial-canon characters
OTHER CHARACTERS: Elphaba Thropp (Wicked MV)