Here is a review for marvelingmutant

My comments will be in bold

Basics and grounding

Interesting this is the first one of these I've had to review. Been a pretty long time since I've taken an interest in this universe so I might be pretty rusty.

Character information

For the most part this is pretty good. Her personality works pretty well in my opinion and her appearance is pretty well described. You however didn't tell me her hobbies or anything like that so maybe just go into more detail with information about her.

Relationships

Through research I don't think these are relations to cannon so I have nothing to say on that so just make sure you expand and develop these relationships.

Backstory

I actually kinda like this. Due to class and power when black butler is set, these kind of things are possible. My only issue is that there's a connection to the underworld with the family. Normally there has to be a deal I'm pretty sure for there to be an interaction with demons. You gotta work out how they are actually connected to the underworld but that's like all I can really think of aside form maybe add a couple more positive things.

Stats

Stats are pretty high I always suggest balancing a 5 with a 1 and 4s with 2s to maintain balance.

Final thoughts
I think you've got some preety good ideas and concepts here but you have to work on adding my detail and smoothing out some bumps.

*My critiques are simply at your request and to help improve your character. It is not my intention to cause any offence and you, of course, do not have to listen to what I've said. This is all just a bit of fun and I apologise if I have done any kind of damage*