How to Say "Joker" in Japanese

ジョーカー

jōkā[d͡ʑo̞ːka̠ː]

The English word "joker" can be said in Japanese as ジョーカー (jōkā).

ジョーカー refers to a person who makes jokes.

Meaning: person who makes jokes (noun)

How do you pronounce it?

jōkā

If you call someone a ジョーカー in a serious conversation, they might think you are referring to a villain from a comic book or a person with a chaotic, unpredictable nature.
The Japanese language has a specific term, お調子者 ('ochōshimono'), for a person who gets carried away with their own jokes, which is a more nuanced description than ジョーカー.
In Japanese gaming culture, a 'joker' element in a story or game often refers to a hidden trump card or a secret weapon used to turn the tide of a battle.

ジョーカーはオールマイティーでいいよね？
The Joker is the wild card, OK?
This sentence shows how to use ジョーカー to refer to a wild card.
Tatoeba #1130386 by mookeee, translation #1156861 by mookeee

Youta and Himari are talking about a new friend.

陽太 Yota

新しい友達は面白い人だね。
Atarashii tomodachi wa omoshiroi hito da ne.
Our new friend is a funny person, isn't he?
陽葵 Himari

うん、本当のジョーカーだよ。
Un, hontō no jōkā dayo.
Yeah, he's a real joker.
陽太 Yota

いつもみんなを笑わせてるよね。
Itsumo minna o warawaseteru yo ne.
He's always making everyone laugh.
陽葵 Himari

だからみんな彼が好きなんだよ。
Dakara minna kare ga suki nan dayo.
That's why everyone likes him.

Sources

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