ototo

It means literally: younger brother

Don´t talk with unknown people, ototo

In Naruto series, Sasuke is Itachi´s ototo.

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ototo-kun

"ototo" (オトト, 弟) is Japanese for "younger brother"

"kun" (くん) is a Japanese suffix used to address a male, typically casual friends, family, or children.

Japanese: " 彼女のオトトくんは面白いです "
Japanese (Romaji): "Kanojo no ototo-kun wa omoshiroidesu."

English: "Her little brother is interesting"