陰キャ
Inkya
いんきゃ
Short for 'inki na kyarakutaa' (gloomy character), this term describes someone who's introverted, shy, or bad at socializing. While it carries a negative connotation, there's a whole culture of people self-identifying as inkya for self-deprecating humor. Sometimes written as 隠キャ. The opposite is 陽キャ (youkya) — an outgoing, sociable person.
Examples
陰キャなので立食パーティとか無理だわ
I'm such an inkya — there's no way I can handle a cocktail party.
Turning down a party invitation
陰キャだけど推しの話なら何時間でも語れる
I'm an inkya, but I can talk about my oshi for hours.
Self-introduction on social media
陰キャ同士で集まるの楽しいよね
Hanging out with fellow inkya types is actually the best.
見た目陽キャなのに中身陰キャの人いるよね
There are people who look like youkya on the outside but are totally inkya on the inside.