架空の

fictional

→ 架空
phrase Rare #41,901
fictional Used before a noun for something invented or imaginary, such as a character, creature, or place.
JA: これは架空の町です。
EN: This is a fictional town.

“ニコ・ラサルテは―”“カレン・サルドンによる架空の人物”

“Nico Lasarte is—” “a fictional character created by Karen Saldon.”

— 嵐の中で (2018)

竜は架空の動物だ。

Dragons are mythical creatures.

トムは私の架空の友達なの。

Tom is my imaginary friend.

君はネッシーなんて架空の存在だと言うが、僕はいると思うよ。

You say Nessie is just a mythical creature, but I think it exists.