我
ガ, われ, わ, わ.が, わが, あ, あが, か

ego, I, selfish, our, oneself

JLPT1 G6 S7 F829

The relevant oracle bone form of this character is a variant of 戈 spear/halberd, indicating a weapon/knife with a serrated blade (i.e., a blade the teeth of which are in alignment).

[Full Kanji Etymology List]