I will be in charge.
I will state my opinion.
Refers to acting out of self-interest rather than fairness. Often used in negative contexts.
His judgment is influenced by personal bias.
Used when something is kept private or not disclosed. Often appears in phrases like わたくしにする (keep secret).
Please keep this story confidential.
わたくし is a very formal, gender-neutral way to say 'I' used in business or ceremonial speech, whereas あたし is casual and feminine.