Sergeant Joanne "Devil Dog" Kang, former Marine and currently, employed as a SHIELD agent, largely due to her involvement in a program that tried to emulate the Super Soldier program when Captain America was, in a word, 'created'.

Jo feels like she has a lot to offer and always feels held back, but she's ready to prove herself whenever she's allowed the chance. She's as loyal as they come and frankly, my adorkable wide-eyed optimist. She's certainly got more happy in her than Lupin does at times.

Also, she's dating a Jedi.

...it's a long story.