At one convention I was mistaken by several people for a different character from the correct game series, but didn't really bother to correct them.
Then two years ago I was dressed as a character from Dynasty Warriors, and some woman walking by me goes, "Oh cool, Green Ranger" and I'm thinking "WTF?" I didn't even bother, she seemed ignorant enough to not even listen if I corrected her.
TGS2014 - Zhurong (DW8) and fem!Kotetsu (Tiger&Bunny)
BIGBANG Concert - Fantastic Baby G-Dragon
Winter Comiket - ???