My ex-stepmother
She would trash the place, throw objects at my dad, punch and hit him, insult him, use my half-brother as leverage against him, would come home late at night just scream at him claiming that he isn't my brother's true father, threw objects at my brother, hit him, whipped him with a belt (didn't realize that there was anything wrong with that when I was younger), threw him at a door, and threw him onto the ground right before physically attacking my mom. She, thankfully, to my knowledge has stopped doing this shit to him, probably because she'd get in trouble for it. She also once kicked him out of his apartment, leaving him having to couch surf for several days.
She also used to harrass my mother a lot and would call the police on her for all sorts of dumb reasons. She had this really weird obsession with her and hated her. She also attacked her twice in one day for no reason.
On the less serious and less abusive side, she would try to turn me against my mother, once she got upset at me for being a bit of brat and on the taxi ride home threatened to break off her engagement with my dad, claiming that she didn't want to deal with bratty step-daughter or something along those lines and made me beg for her not to. She told me that my only loved me because of things she get from using me. She screamed at me after finding out that I told the police about what her throwing my brother and guilt-tripped me into revoking my statement the next time I got interviewed by the social worker. Once she threatened to cut off all of my hair out of nowhere while we were walking to the barbershop to get my brothers hair done and then walked up to that lady at the front and told them to shave off all my hair. She made me cry and beg her not to. She would do my hair secretly cut off large portions of my hair under the guise that she was "cutting off dead ends". She also sent my mom a bunch of vile text messages insulting both her and me and caused me to not be allowed to go to my dads place. She's also randomly grabbed and squeezed/attempted to grab and squeeze my books back when I was in middle-school on three separate occasions if I remember correctly (I know it's not that of deal, but it's kind of weird). Those are just a few examples of some of the stuff she has done. There's probably more that I can't remember since I don't think back on this stuff too often. I'm more focused on the things she's done to my dad, mother, and brother, since they were all significantly worse.
She was a weird and horrible lady and I eventually had enough with putting up with her near the end of grade 8. I haven't spoken to her since I was around 14 and I'd like to keep it that way. She has her nice aspects, but I don't think that those are enough to outweigh the bad.