noun
gloomy person; introvert; dark personality
Slang abbreviation of 陰キャラ. Used in youth culture to describe someone with a gloomy, introverted, or socially withdrawn character. Often contrasted with 陽キャ (outgoing person).
See also: 陰キャラ
あの子は陰キャだから、パーティーには来ないと思う。
That kid is an introvert, so I don't think they'll come to the party.
陰キャと陽キャ、どっちが好き？
Which do you prefer, gloomy types or outgoing types?
Full form of the abbreviation; same meaning but slightly more explicit.
Abbreviation of 陰キャラ, itself a blend of 陰 (in, 'shade, negative') and キャラクター (kyarakutā, 'character').