I kind of named myself after an OC (wince), does that mean they're an automatically a Mary Sue?
Anyway, Crimson storm is a revolutionary Trot-skyist originally from Skewbaldistan. She is crimson and her cutie mark is a yellow hammer/sickle (or both).
She wears her black mane in that braid that show ponies often use but sometimes it comes undone in untameable locks.
Humourless, passionate and at times quite scary, she refuses to bow down in the presence of Celestia who she calls, "The Autocrat".
Ideally, I'd her to be staring formidably at the viewer through her mane and a way that lets you know she won't back down to anypony.