Deku is the nickname of Izuku Midoriya, the main character of My Hero Academia, the manga series created by Kohei Horikoshi that began in 2014 and was adapted into a popular anime. Short voice lines from the show are widely clipped and shared online as reaction sounds because the characters deliver emotions in a very clear, expressive way. This particular line became used as a standalone soundboard clip for moments of confusion and surprise, shared in edits, streams and group chats alongside other anime reaction sounds.
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Deku asking who is this in a confused tone from My Hero Academia, used as a reaction sound for surprise introductions, callouts and awkward reveals.
This clip captures Deku, Izuku Midoriya from My Hero Academia, asking who is this in a puzzled and slightly startled voice. The delivery is quick, earnest and a little nervous, which makes the line feel like a genuine moment of confusion rather than a joke. Played on its own it instantly signals that someone unexpected has appeared or been mentioned. Viewers familiar with the character recognise his earnest tone straight away, while others still read it clearly as a confused reaction, making it useful even outside anime edits.
