Why is tsundere associated with red?

Tsunderes are hotheads. That said, Mio is a gravity magic user.

Is it?
There are plenty of blond tsundere.

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>black hair
>tsundere

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>>151102560
Did the Japanese pick up the anglo trope that redheads are hot-blooded, quick to anger, etc.?
It got used a lot in early/mid-century western media when it was still acceptable to make fun of the subhuman race known as Irish.

>>151102560
Asuka

>>151102560
Tsundere is associated with twintails.

>>151102560
red oni blue oni

>>151104045
Wasn't the Red oni just dere for the blue oni?

"Fiery Redhead" cliche

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>>151104110
Blue oni is yandere for red oni.

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>>151104045
Don't forget yellow oni.

>>151102560
Same reason why OPs are associated with faggotry.