For example 恐 is made up of “saw” and “heart,” so it is made up of two radicals.
Are there any kanji made up of five? Six? Seven?
What kanji has the most?
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Four is the most, because that’s how WaniKani is set up. Basically, if a kanji (especially one made up of a number of radicals) appears as a sub-unit in later kanji, it’ll be re-introduced as a radical again in order to use it as a building block.
Though one does idly wonder how many you’d get if you recursively broke down multi-component radicals into their individual parts. For example, 諭 (in level 53) is made up of two WaniKani radicals, but that’s because the whole right-hand side is introduced as a single (non-unicode) radical called “Death Star”, but you can also think of that as “hat”+“ground”+“moon”+“knife”…
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Yes. I also wonder, but it’s really unhelpful to break things down rather than doing the opposite - so yeah. I mean I’d rather avoid having to break down radicals like psychopath further when they are visually distinct on their own. 
While it is a bit ridiculous to call a radical deathstar, it IS visually very helpful. ^^
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I wish WK was consistent about this. This is sadly very often not the case
A few examples:
And some that @Arzar33 once mentioned in a post:
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Similarly, I had thought of making a dependency tree once to see, for example, which critical radicals, if deleted, would wipe out the most kanji and vocabulary. (assuming radicals can depend on other simpler radicals)
I’m too lazy, though.
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I was planning to mention “psychopath” first, but decided I couldn’t describe the top-left corner in terms of simpler radicals (though in hindsight, I guess it’s “treasure”+“box”+4x"drop").
If you go far enough, it turns out the elementary building block of every radical is individual strokes, which exactly what WaniKani uses the radical system to avoid. 
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It would be kind of a fun toy to have a table like this:
… and so on, but if you click on any item it gets “deselected” and turns black. Also, any item in the table that depends on the one you deselected also goes black.
Or maybe in another mode, they all start deselected, and you can select one, which also highlights all the previous items the selected one depends on.
No practical use really, but it would be fun.
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I am nosy and this seemed like an interesting question, so I got some info from the api. The highest number of wanikani radicals in a kanji seems to be 5, in these 10 kanji:
寝 - lie down (level 22)
演 - perform (level 23)
優 - superior (level 23)
極 - extreme ( level 27)
換 - exchange (level 36)
懲 - chastise (level 43)
滅 - destroy (level 43)
瓶 - bottle (level 51)
蔑 - scorn (level 59)
慶 - congratulate (level 59)
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I’ve long wanted to create a Wanikani addon or independent study tool that allows you to hover over kanji like this and see its component parts.
It would take a lot of work to make that though.
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Huh, well whaddaya know. Could have sworn the limit was four…
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