It's very dark, but I think a kid who likes Dangan Ronpa might well enjoy Death Note! Netflix rates it a 12, although, to be honest, I'd have expected a 15. You could try her out with the first volume of the manga, which is a bit less graphic than the anime; it looks like you can get used copies for under three pounds on Amazon. (I don't know if she's experienced with manga already; if she's not, she might need to be told that it's read from right to left.)
The concept, if that helps: a teenage boy, Light, obtains a notebook that can kill anyone whose name is written in it. He starts using it to kill huge numbers of criminals, with the goal of creating a 'perfect' world without crime. The story deals with Light's efforts to avoid being caught by the police while they try to track down this mysterious supernatural murderer.
Most of the deaths are bloodless heart attacks, but there are occasionally more graphic deaths. This early scene where a lorry hits a motorbike is on the upper end; pages/panels/text bubbles read from right to left. There's also at least one forced suicide, which doesn't take place on-screen/on-page; we see a woman walk away and we know that she'll die by suicide, because that's the instruction that Light wrote in the Death Note. (The anime shows a symbolic shot of her walking onto a gallows, but it doesn't show her death; the manga just shows her walking away down the street.)
The lorry crash scene takes place in the first episode of the anime, and also includes an attempted sexual assault that is not in the manga, which is part of the reason I think the manga might be better for a twelve-year-old. (The anime version of the scene is here, if you're curious; as stated, it contains attempted sexual assault. In the manga, the motorcyclists surround the woman to ask her out, and she's obviously uncomfortable, but they don't touch or attack her.) This is probably the most 'mature' the anime gets; if she's okay with the first episode, she'll probably be okay with the rest of it.
I hope all this is helpful! My first response was 'oh, yeah, a Dangan Ronpa fan, she'll like Death Note!', but I didn't want that instinct to override responsibility, so I thought I'd better give a detailed response and let you use your own judgement. Both Dangan Ronpa and Death Note involve a lot of murder, but the violence in Death Note is less cartoony and the tone is more serious.
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The concept, if that helps: a teenage boy, Light, obtains a notebook that can kill anyone whose name is written in it. He starts using it to kill huge numbers of criminals, with the goal of creating a 'perfect' world without crime. The story deals with Light's efforts to avoid being caught by the police while they try to track down this mysterious supernatural murderer.
Most of the deaths are bloodless heart attacks, but there are occasionally more graphic deaths. This early scene where a lorry hits a motorbike is on the upper end; pages/panels/text bubbles read from right to left. There's also at least one forced suicide, which doesn't take place on-screen/on-page; we see a woman walk away and we know that she'll die by suicide, because that's the instruction that Light wrote in the Death Note. (The anime shows a symbolic shot of her walking onto a gallows, but it doesn't show her death; the manga just shows her walking away down the street.)
The lorry crash scene takes place in the first episode of the anime, and also includes an attempted sexual assault that is not in the manga, which is part of the reason I think the manga might be better for a twelve-year-old. (The anime version of the scene is here, if you're curious; as stated, it contains attempted sexual assault. In the manga, the motorcyclists surround the woman to ask her out, and she's obviously uncomfortable, but they don't touch or attack her.) This is probably the most 'mature' the anime gets; if she's okay with the first episode, she'll probably be okay with the rest of it.
I hope all this is helpful! My first response was 'oh, yeah, a Dangan Ronpa fan, she'll like Death Note!', but I didn't want that instinct to override responsibility, so I thought I'd better give a detailed response and let you use your own judgement. Both Dangan Ronpa and Death Note involve a lot of murder, but the violence in Death Note is less cartoony and the tone is more serious.