Very little is given away about Evelyn throughout The Rainbow Orchid. The only hard fact seems to be that she works for Urkaz Grope. We can see she's resourceful, often using deceit as a weapon, though she also keeps a handgun and a pocket knife handy. That's if she even needs them - her unarmed combat skills have evidently benefitted from training, possibly karate from the style of some of her techniques.
She's a careful planner and a strong leader, as well as incredibly loyal to Grope, even going so far as to kill those who would get in her way - she doesn't seem to be too troubled by empathy. Her self-confidence knows no bounds; she's genuinely shocked when the tables get turned on her (a rare event). She's smart, classy, and probably a little vain.
Evelyn may have a blank on her character's history in the story, but I can at least offer something regarding her creation. Like Lily Lawrence her origins lie in the abandoned short comic I wrote in 1996 called Stage Fight - a story that would eventually be produced as Sword of Fate, Lily's origin tale, in The Girly Comic. Stage Fight featured a character called Evelyn Saxon, a Victorian vamp with a wine bottle in one hand and a couldn't-care-less attitude in the other (I renamed her Eleanor Saxon for Sword of Fate). You might see a future echo of her in the character of Josephine Bolan from my episode in Blank Slate's Nelson, and if you happen to know some of my much older work then you might see a more distant version of her as The Sorceress from my fantasy story Realm of the Sorceress.
Physically she is a 1920s modern woman with a straightforward yet stylish hairstyle that matches her character, inspired by some of the more self-determined figures of the silent screen: Louise Brooks, Clara Bow, Pola Negri, and a little Theda Bara for good measure. Another more recent similarity has been noted - with that of Irina Spalko, played by Cate Blanchett in Indiana Jones and the Kingdom of the Crystal Skull (though Evelyn predates her).
I mentioned earlier that Evelyn Crow carries a handgun and I'd like to say something about my philosophy of gun use in The Rainbow Orchid (and in my stories generally). When Evelyn fires the gun it has consequences - people get hurt, and I don't just mean cartoon-hurt (even though this is a cartoon strip). I hope you feel that Tayaut is in real danger from his bullet wound, and you can also see the effect it has on his friends and loved-ones, not to mention the death that also occurs. And, of course, Evelyn becomes a victim herself later on, again with consequences that affect characters and story.
For me, when a gun is introduced into the plot, it is not as a solution - it does not enable the hero to solve the problem of his antagonists; it is a complication. I hate films where a gun is just a toy-device that blasts people away with no effect on lives or story. I'm not against action films with guns, even fairly violent films to some degree - as long as there are consequences. It's a matter of the weapon having weight, a weight that reflects what can happen in the real world - I think that's important.