heterochromia; mismatched eye colors
Wasei-eigo from 'odd eye'; refers to a condition where a person or animal has eyes of different colors. Often used in anime, manga, and pet descriptions.
wasei-eigo (Japanese-coined English), from odd eye
See also: 虹彩異色症
That cat had odd eyes: one was blue and the other was green.
アニメのキャラクターにはオッドアイの設定が多い。
Many anime characters are designed with heterochromia.