The beginning of the Star Trek fic Safe and Sound has the young Lucille Harewood confronted by two boys who accuse her of being a terrorist like her father - and proceed to beat her up for it. If she hadn't had Khan's blood in her, she would've been seriously injured.
From the Gensokyo 20XX series, we have Yume Ni "Yu" Yakumo and it is to such a degree that the other kids prefer Reimu over her, especially, when she hits them. Apparently, she seems to have a Lack of Empathy, seeing as she tried to throw Reimu (attached to an IV) over a railing, the which of could have either killed or injured her, along with a nonchalant to eager tone about the other kids being her bitch.
Ojamajo Doremi Rise Of The Shadows: The Shadow Ojamajos are the same age as their counterparts (read: ages 11-12 for the older girls, 8-9 for the Tagalong Kid, and 2-3-going-on-11-12 for their final member), but they show definite instances of malice. These instances include insulting their counterparts from behind their backs, outright attacking them when given permission, mocking them for expressing grief, and finally killing them in cold blood.