Yes. Capricious means fickle. A capricious person would want to buy a red shirt then in the middle of payment they would change their mind and want a blue shirt instead. Scientists have also...

because a person is a person

it is a person and you.

The first person is I or we; the second person is thou or you; the third person is he, she, it or they. There is no fourth person.

First person. Nope. "He" is the third person, masculine, singular, subjective pronoun.