Monster
Yokai
noun
What's supernatural and suspicious? A monster, or, if you know the Japanese term, a yokai.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
妖怪さん、何か用かい？
Hey, Mr. Yokai. You asked for me, what's up?
この妖怪はいつも半袖のTシャツを着ています。
This yokai always wears a short-sleeved T-shirt.
妖怪の友達がいるなんて、羨ましい！
You have a yokai friend? I'm jealous!