What is the name of the Yo-kai butler who assists Nate?

The Yo-kai butler who assists Nate is Whisper.

Whisper is the first major Yo-kai Nate encounters in the original Yo-kai Watch story. Nate discovers Whisper trapped inside a capsule beneath a sacred tree and frees him. In return, Whisper becomes Nate’s self-appointed butler and introduces him to the hidden world of Yo-kai, supernatural beings inspired by Japanese folklore.

Whisper helps Nate understand how the Yo-kai Watch works, including its ability to reveal creatures invisible to ordinary people. He also accompanies Nate during investigations, battles, and attempts to solve problems caused by mischievous Yo-kai. Although Whisper presents himself as an expert, he frequently relies on his tablet, the Yo-kai Pad, to look up information.

The other choices are different characters. Jibanyan is a cat-like Yo-kai and one of the franchise’s central mascots, Komasan is a gentle komainu Yo-kai, and USApyon is associated especially with Yo-kai Watch 3. Whisper’s role as Nate’s comic, often unreliable guide makes him one of the series’ defining characters.