<a href="http://eoghann.com/2014/05/marvel-comics-cosplay-viper/10256997_297601240398757_5146528980600804158_n" rel="attachment wp-att-118815">Here's a character you don't see so often in cosplay. Viper, or Madame Hydra as she used to be called.
Madame Hydra is a character with a long and storied history in the Marvel Universe. She is I guess primarily a Captain America villain but she's shown up in various places over the years.
This rather well photographed cosplay is not only a good version of the costume but she's got the scar as well (though I think currently in the comics the scars are gone, it's hard to keep up).
Source: Facebook — Angi Viper