Er.... Mythos... hate to break it to ya but your character is kind of a sue. Okay, shes... a big Mary sue. *ahem*

-She is litterally the daughter of Satan yet comes from 'a broken home' which forces her into stealing. And its not even like shes a distant relative, shes directly related as their daughter as you've outlined. Why would she come from a broken home that caused her to steal if she is litterally the granddaughter of the Prince of Darkness AND the daughter of fucking DEATH. First of all, thats a slap in the face to my beliefs about the Grimm Reaper, he is no son to the Prince of Darkness. Secondly, Don't think I missed Lillith the baby stealing hag as her mother. She shouldn't be nearly as pretty as she is considering she would litterally be a devil.

-A POOR FAMILY?! It is the freaking PRINCE OF DARKNESS.And DEATH! They have no NEED for monetary value and would rather bargain corpses than coin! It would make no SENSE that she would have any desire to steal as nothing of that would be inherited. Now, as far as if she were a daughter of a greed demon, that would make sense.

-Who exactly IS the rich here? If its not the fucking Prince of DARKNESS or my beloved religious icon Death, I seriously want to know.

-A ten year old. Offed a Demon king? Are you bloody looney? A ten year old doesn't want to get off the couch MUCH LESS take it upon themselve the arduous task of reigning hell upon a demon king. Let me break it down for you: You have moats(probably filled with Lava since hes a demon), You have over 500 guards at the VERY LEAST, you have traps, you have executioners, torturers, the KNIGHTS which are probably demons and therefore merciless, THEN YOU HAVE the audience chamber constantly filled with guests that would SEE YOU, and THEN you have the King. And This is a damn DEMON king you're talking about. NOpe. nope. NOPE. No ten year old can do that I'm not listening lalalallalala

-There is no point in having so many damn assassins at rest or no. Either you're an assassin or you're not and assassins travel in twos USUALLY. haing a whole group is bad choice and not as effective as you'd think. You might as well just keep it to the two companions. 

-most formidable in all of hell? No, you hear RUMORS that shes the most formidable force in hell, there will always be those who don't believe.
 
-Really? She's mysterious but EVERYONE KNOWS ABOUT HER? Puh-lease. And she stabs them in the back? thats fucking TERRIBLE business. WHY does she stab them in the back? WHY is she so murderous. If shes a bitch keep her as a bitch to everyone, she should NOT Be liked this point but feared and avoided at all costs. A bitch, is a bitch. There is NO nice side to a bitch. Keep it consistent.

-Oh she cannot turn anything into a weapon. Shes not damn blacksmith. and WHO trained her to wield anything shes 'Mastered?'

-What the fucks with the dragon? Where did she get the dragon and where did she learn to summon it?

-Yeah, instant kill on everyone who stands around you? Why the fuck bother with weapons then? That is OP as hell and you know it.

-Oh she can't die, riiiiight. Because she learned how to heal right next to the stabbing lessons. There is no reason for an assassin to ever learn to heal. Medicines they carry on them are far more practical and this just highlights the fact that she's a sue. She can't die? Okay great, see you in 100 years when everyone you know is dead. 

-okay where the hell did she learn to summon? Honestly this is getting tiring. Why have wolves that can't be killed? The flames I admit are cool, but you're seriously overkill. Again with the thing that she can't die that's OP as fuck. This wouldn't be fun to rp with, it'd just be catering to what YOU want.

-oh. My GOD. okay that's the last straw with the Dragon. DEATH, DOES NOT, DO, DRAGONS. DEATH IS AN ENTITY THAT CANNOT PRODUCE OFFSPRING AND WOULDNT HAVE TIME TO RAISE A SPOILED ASS BRAT LIKE SASHA. I can't explain how angry it makes me when my effigy is used to someone as low as you. Next time, fucking think about how you might offen other religions next time you spew up about Death. 

If you refuse to change, I'm gone. I have no reason to be here if you intend for me to rp with something thats a blatant slap in the face to my religion, and a mockery for a character. If you intend to throw me out for my highlighting how your character is a Mary sue, I won't lose anything. I'm here to rp with you, and I won't lose sleep over not rping if you go through with asking me to leave.