Self - loathing and low self esteem in general! She's always felt really insecure about herself, and she has really bad anxiety when it comes to certain things. She struggles with depression, but is the type to internalize her own feelings for the sake of lifting up others. A lot of days she feels like she's kinda going through the motions, especially if it's an au where she doesn't have a good support system or anyone close to her.

A lot of the flaws Sonia has are some things I've dealt with IRL because it's easier to project them onto her, and I've lived it so I have a easy time writing for her low points ,;w;: