Why is ちゃった used here?


> いやあ… いつの間にかすごい人になっちゃったんだなあ｡ 僕の知ってる鴫野は いわゆる オタクっていうか一人で ずっと ゲームやってるような奴だったのに｡

Isn't ちゃった used for regrets?




ちゃった is a contracted form of -てしまった. This しまう (仕舞う in kanji) originally means
"to end (up)". See [this
entry](https://jisho.org/word/%E4%BB%95%E8%88%9E%E3%81%86) on jisho. Just like
"to end up" in English does not always imply an undesirable outcome, Japanese
ちゃう/てしまう does not always express the sense of regret. Here, すごい人になっちゃった just
means "he ended up becoming a great person" or "he turned out to be a great
guy".

See also:

  * [「しまう」 as an auxiliary verb](https://japanese.stackexchange.com/q/21026/5010)
  * [What are these forms: かけちゃお, つないじゃお?](https://japanese.stackexchange.com/q/4781/5010)
  * [What is the meaning of てあげられちゃうんだけど](https://japanese.stackexchange.com/q/56515/5010)




ちゃった is a contracted form of -てしまった. This しまう (仕舞う in kanji) originally means
"to end (up)". See [this
entry](https://jisho.org/word/%E4%BB%95%E8%88%9E%E3%81%86) on jisho. Just like
"to end up" in English does not always imply an undesirable outcome, Japanese
ちゃう/てしまう does not always express the sense of regret. Here, すごい人になっちゃった just
means "he ended up becoming a great person" or "he turned out to be a great
guy".

See also:

  * [「しまう」 as an auxiliary verb](https://japanese.stackexchange.com/q/21026/5010)
  * [What are these forms: かけちゃお, つないじゃお?](https://japanese.stackexchange.com/q/4781/5010)
  * [What is the meaning of てあげられちゃうんだけど](https://japanese.stackexchange.com/q/56515/5010)

