Feel free to answer as jokingly or as serious as you like
The stranger/more creative the better
feel free to add a leftist twist
Bigfoot
go as a tree disguised as a lumberjack and then walk around whistling innocently
Full wizard or druid get up with the robes and walking staff, it’s a must.
raccoon
Tree hugger. But with like one of those “free hugs” signs. You’re the tree.