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In Saiyuki, there is a scene of a pre-teen Gojyo smoking in his room while his older brother calms his stepmother down.He was, at most, eight or nine years old at the time. Kenshin too, when he buried all the bodies of his guardians and the men who killed them, instead of, say, trying to find help.Seta Soujirou of Rurouni Kenshin, given his horrible childhood and subsequent "adoption" by a Social Darwinist to act as his Dragon, slaughters people with a cheerful smile.From what can be gathered from the tiny flashbacks, she was raised on the streets of a less-good place in New York City and probably learned her gun skills from gangsters, and killed someone using a pillow as a silencer when she was still pretty young. And tragically, they can't even imagine the world any other way. The sheer number of people they kill (and how they do it) is just the start of how messed up these two are. Not to mention how he acts as if he is trying to seduce any male character within five feet of him. For the whole first episode, he goes from acting completely innocent to downright crazy within a few seconds, and switches back and forth between the two personas. Oh, did I mention he will command his awesome butler to kill people without a second thought? In the manga he's also seen drinking champagne with his guests, but that could be because of his status, the time period, and the overall culture back then. but his darker view on things is because of a traumatic past experience. At the mere age of 13 (he starts off 12, but turns 13 early in the series) he is the head of the household, runs a successful toy and confectioneries company, and is the "Queen's Watchdog" which sends him out on often very dangerous and frightening missions such as helping to catch Jack the Ripper. Black Butler has Ciel, an aristocrat living in Victorian London.Lucy (and to an extent most of the Diclonii) in Elfen Lied are extremely homicidal little girls.Michio Yuki, the Villain Protagonist of MW, has become this the moment he becomes Ax Crazy by the titular chemical warfare.
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From the Mouths of Babes is the Sub-Trope where the child only says troubling unchildlike things. The Creepy Child, the Enfant Terrible and the Evil Orphan draw much of their force from this. Other times, the kid is trying an "adult" behavior for the first time, which may sometimes have disastrous consequences. Sometimes the kid is shown engaging in such behavior as though it's normal for them, and this can be used to show that the child has had a harsh upbringing.
![rule of rose tvtropes rule of rose tvtropes](https://static.tvtropes.org/pmwiki/pub/images/e344dc214801d845ce1893b39702c487_original_4.jpg)
In fiction, there's two ways this tends to occur. Yes, many adults are upset when a teenager drinks beer, but it's disturbing when a 10-year-old does it. What we don't expect kids to do is to drink alcohol, smoke, have sex, use drugs, hitchhike, commit violent crimes, or do other things we associate only with teenagers or adults. That means worrying about little kid things and doing little kid things, such as playing on the trampoline, watching TV, going fishing, or whatever it is that kids do locally. Kids should be kids, at least that's how the saying goes.