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Fooly Cooly has something kind of like that... except the Demon is inside of him, and then he controls it.
There's a graphic novel whick is kind of in the style of anime but if you're thinking of an tv show then not at the moment.
parallel and series
I think he's over 500 as a demon but the anime regards him as about 15 in some kind of human age. Its kinda confusing.
Anime has a vast collection of characters and series. Its up to you what kind of content you want. SSJ_ANIME_editz you can check my channel on youtube , I have many anime series shorts and videos. You can choose from there.
All electricity or electronic circuits will not allow the current to flow if they have switching devices in series in their circuits.
The only demon king I know for sure is the earth kind Amaimon.
There are various genres of anime that could potentially be popular with various age groups. Anime now is very broad: with child-like series, religiously-related, pornographic, political, feminine, technological etc.
親切な悪魔 /shin se tsu na a ku ma/ means 'kind demon' in Japanese.
Alternate Current is one kind of electricity.
anime and manga clubs are kind of ick
tragical