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Pronouns Rule
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Ok so わたし is formal and わたくし is very formal.
Can you give me please an example for an informal "I"?
ぼく, おれ or あたし are pretty good examples of informal ones. You'd only use those with acquaintances pretty much.
Note わたし isn't specifically formal per se, it's just very neutral so it works in a lot of formal contexts too.