There will be three different options. One good. One neutral. one evil.
Lawful Good
A woman who’s power is only to read minds. She isn’t battle ready, as disappointing as that was to the Council. However, her usefulness of being able to delve deeper into the subconscious and memories was very helpful. If only given a lot of time with someone or thing. Some cases were harder to crack, taking months to find what truly motivated them. Of course, it’s not a very comfortable process for the person it happens to. She is to be used to find the core issue or cause off aggression within another scp as the organization would like to fix it to prevent further aggression. However, such attempts rarely work. Even knowing what causes their aggression does not mean there is any treatment for such a thing. However, there are a few she desires to make a break through with. For the betterment of containment, and for the safety of humanity as a whole.
Chaotic Neutral
A “spirit” involving boundaries, similar to the old man’s pocket dimension, but can also open portals from place to place. The SCP would be aiding with containment as she needs humans and their religious beliefs to survive. So if major threats to humanity broke containment then she would disappear. Otherwise, what occurs is of no business of hers and causes too much strain on her being to keep in line.
Chaotic Evil
A wandering sorcerer who finds joy in chaos, and many other things, decides to release a powerful SCP, under only one condition. That he serve her and never leave. To bind them together for eternity via the magic within the width of her powers. She cares not for whatever becomes of the facility that contains him, only that he cater to her interests and amuse her ideas and experiments.
I would prefer it to be one of these that would be with another SCP character. Dm if interested. We can also adjust to make it non-SCP related if that is not your style and go for a more medieval approach.