Oneself, Self
The kanji and the radical are the same, so remembering the meaning of this kanji is as simple as making sure you know the radical for oneself first! If you know the radical, you know this kanji means oneself as well.
Make sure you know those radicals, yo!
こ, き
おのれ
None
Oneself. Who only thinks of oneself? Every 子 (こ) in the world.
Kids can only think of oneself. Until a certain age, that's literally all they can care about.