This is the 465th most frequent Japanese word.
君
"君" (kimi): You (informal, often used toward equals or subordinates).
In this sentence, '君たち' (kimitachi) is the plural form of '君', addressing a group of people warmly and informally.
君たちは遅れていますよ。
You all are late.
Here, '君' is utilized to refer to the specific 'you' whose choice is mentioned, suggesting a close connection or friendship without being overly formal.
君が選んだ色を試してみます。
I will try the color you chose.
Here, '君' (kimi) is used as a personal pronoun meaning 'you', indicating familiarity and closeness, often used in addressing a friend or someone close.