I recognize the heart radical at the bottom of the kanji 悪, but I cannot make my mind about the upper one.
I have some notions of Chinese, and I don't seem to recognize a similar radical. I have been told Kanji/Hanzi have been simplified differently during history depending on Chinese or Japan. So maybe there's a different simplified Chinese form for this one.
Do you know the name of this radical ?
It is 亜【あ】, which is not only a component (calling it radical is technically wrong) but an independent character that even has a dedicated page on Wiktionary.
Do you also know of another Kanji using this radical?
Yes, and there is a relatively user-friendly website to look up kanji if you read Japanese.
When you search for 悪, you will get its decomposition ⿱亜心. And if you put 亜 in the search form as "component" (部品), you will get a handful of characters. But if you see the information page of 亜, you will be notified that its traditional form is 亞, which is likely to be used in more (i.e. non-常用) kanji. So if you look up 亞 as component, you will get a bunch of characters. Here is the dump:
唖 亜 𪰥 𨉼 𤩖 𤉁 𣱌 𣊰 𢳩 𡏍
鵶 閸 鐚 錏 蝁 稏 癋 瘂 琧 氬 椏 斵 掗 惡 孲 婭 壼 堊 埡 噁 啞 僫 俹 壷 䢝 䜑 䛩 𪹪 𪅴 𩸖 𩸋 𩸇 𩰚 𩭯 𩩤 𩤃 𩜄 𩗽 𩓩 𨷵 𨮃 䃁 𨁶 𧢗 𧓥 𧑕 𦼇 𦲕 𦩒 𦠲 𦜖 𥼳 𥺼 𥮳 㰳 𥦳 𥏝 𤺘 𤲾 𤲢 𤩾 𤦩 𤡾 𤊗 𤃮 𣽏 𣵾 𣩤 𣤼 𣣾 𣡆 𣛽 𣉩 𣇩 𣂪 𢵣 𢩔 㝞 𢛟 𢑹 𡹅 𡹄 𡱻 𡢇 𡔶 𡈧 𡈀 𡀄 𠼞 𠻺 𠨣 𠠇 𠜲 𠆊 𠁕 𠁐 𠁏
The upper part of 悪, 亜{あ} itself is not a radical, but if you take the kanji 亜, it's radical is 二.
Most people use a method that is based on dividing the Kanji into left and right sections, where in most cases the left half of the Kanji represents the radical (辺).
However, this method doesn’t usually work when the radical is located at the top, is surrounding, or only occupies a corner of the Kanji.
In conclusion, it requires (1) a lot of practice, (2) an intimate knowledge of the Kaji, such as (3) knowing its origin, (4) the order of its strokes, and (5) the Kanji’s interpretation in order to accomplish what you’re trying to do, and identify its radicals.
Hope the above helps :)
