A childish, cute, or playful first-person pronoun used mainly by young boys or in a self-infantilizing, humorous way. Not used in formal or polite contexts.
I wanna eat lots of sweets today!
My little brother said, 'I'm coming too!'
Katakana spelling, sometimes used for emphasis or in stylized contexts.
Formed by attaching the diminutive suffix ちん to the first-person pronoun 僕 (ぼく). The suffix ちん is a variant of ちゃん, used to create cute or childish forms.