君こそ

you, of all people

→ 君
phrase Rare #23,049
you, of all people Emphasizes 君 (you), often with a contrastive or retorting sense: “you’re the one” or “you, especially.” 君 is a familiar, generally informal way to say “you.”
JA: 君こそ、私が会いたかった人だ。
EN: You’re the very person I wanted to meet.

君こそ何を永束バカ言ってくれるなよ

You of all people—what are you talking about? Don’t be ridiculous.

— 映画 聲の形 (2016)

君こそなぜ

Why you?

— パディントン2 (2017)

君こそ彼と話した方がいい

You’re the one who should talk to him.

— Hoje Eu Quero Voltar Sozinho (2014)

君こそペテン師だ

You're the con artist.

— エリート・スクワッド ブラジル特殊部隊BOPE (2010)

君こそ私が探していた人だ

You’re exactly the person I was looking for.

君こそこの前のとき退屈そうしてただろ

You were the one who looked bored last time, weren't you?

— グッドフェローズ (1990)

君こそ元気で

You take care too.

— ザ・マン・フロム・アース (2007)

君こそその仕事に最も適任だ

You’re the best person for the job.

君こそ本当の働き者だ

You’re the real hard worker.