Chronological, as far as I can remember

• Skeleton
• Cat (for many years)
• 1996: Fairy
• 1997: Praying mantis
• 1998: Book (Pippi Longstocking)
• 1999: Lepra (creature I made up)
• 2000: Alien
• 2001: Tiger
• 2002: Rum Tum Tugger
• 2003: Gary the Snail (never again!)
• 2004: Morticia
• 2005: Jareth
• 2006: Angel (The Rent character, not the divine being)
• 2007: Evil fairy
• 2008: Mrs. Lovett
• 2009: Puppet Snape
• 2010: Fierie
• 2011: Weeping Angel
• 2013: River Song/Ms. Frizzle
• 2014: Elphaba
• 2015: Zuul!Dana
• 2016: Furiosa
• 2017: Holtzmann
• 2018: Cake Or Death
• 2019: Marceline
• 2020: Enoch the Pumpkin Man
• 2021: Flick Animalcrossing
• didn't dress up, got married instead <3