JoJo: The Great Sage

After transmigrating into JoJo, he gains the Stand Great Sage. See how the protagonist uses a Stand with no combat ability to save people who were destined to die.

The phrase Kujo Jōnochi says most often is, "Blow my head clean off! Why have I seen this before?"

(PS: His deskmate was a JoJo fan, so the protagonist had seen pictures of the characters.)