Noun; a Japanese term indicating a person who shifts to different personalities or renders to another persona. It may be due to the fact that the person trying to fill in the gaps of their blank out personality that they try to be someone else.

Kage meaning shadow, points to the fact that shadows always follow it's owner.

or;

A fanatic of Tobio Kageyama or the Kageyama siblings.
1: You don't look like a Kuudere to me, you're more of a Kagedere to me.
2: You're a Kagedere too?! Can we be friends?
by 𝓚𝓪𝓵𝔂𝓪𝓷 July 20, 2019
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