Seo

Seo (先生, Seo) is a mystery; he appears to Arata Hinohara out of nowhere to offer advice and disappears shortly after.

Personality
Seo has a friendly attitude and acts kindly to Hinohara. Seo does not take things too seriously and isn't one to become frightened easily.

Trivia

 * When translated from kanji, Seo (先生) means Sensei.