In Japanese, boku 僕 means multiple things. Normally, boku means "I" or "me," as a first person pronoun used mostly by boys. It can also mean "boy," as a way to call out a young boy. Originally, it referred to male servants. It's also spelled boku ボク and boku ぼく.
In Japanese, waga 我が means "my," it's a possessive singular first person pronoun, that's rather archaic, but still has certain usage in modern Japanese. Sometimes, it means "one's own" instead.
It's also spelled 我ヶ, 吾が, 吾ヶ, 我, or 吾.
In Japanese, wareware 我々 means "we," or "us." It's a plural reduplication of the first person pronoun ware 我. The word wareware tends to be used to refer to us as individuals members of a group, or of an organization.
In Japanese, ware 我 means "I," or "me." It's a literary first person pronoun that particularly emphasizes one's very existence,. It's not used normally, except in some set phrases, and by some anachronistic or deity-like anime characters.
It's also spelled ware 吾.
In Japanese, washi わし is a first person pronoun typically associated with old men, elders, like a white-haired king of a medieval fantasy country, or an equally ancient sorcerer.
It's also spelled washi ワシ, washi 儂, or washi 私, the latter homonymously with watashi 私. Not to be confused with washi 鷲, which means "eagle," the animal.
In Japanese, oira おいら is a first person pronoun used mostly by men, and, in some cases, a second person pronoun, too, as the plural of onore 己.
It's also spelled oira オイラ, or oira 己等.
In Japanese, atashi あたし is a first person pronoun used mostly by women.
It's also spelled atashi アタシ, or atashi 私.
In Japanese, watakushi ワタクシ is a very formal first person pronoun.
It's also spelled わたくし, and spelled with kanji as 私, but this spelling is sometimes avoided due to a more common word being spelled with the same kanji: watashi 私.
In Japanese, using your own name as first person pronoun is something that very young children do, and that some people in real life, and some anime characters, do in order to appears more childish, sillier, and cuter. Specially girls.
In Japanese, ore 俺 means "I" or "me." It's a masculine first person pronoun, used mostly by men, and the pronoun that most men use. It's considered rude and arrogant in respectful contexts, and typically avoided with honorific speech. It's also spelled ore オレ, ore おれ.
In Japanese, watashi 私 means "I" or "me." It's one of the various Japanese first person pronouns. It's considered polite and feminine in casual contexts, but neutral in formal contexts.
In Japanese, watashi 私, ore 俺, boku 僕, and various other words, all mean "I" or "me," that is, they're Japanese "first person pronouns," ichininshou daimeishi 一人称代名詞.
But why are there so many ways to say "I" and "me" in Japanese? What's the difference between them?
The basic gist is that some pronouns, like watashi, are used by women, while other pronouns, like ore and boku, are used by men, except that in business and formal contexts everybody uses watashi, except some men use boku or watakushi ワタクシ instead. It's complicated.
If you're learning Japanese and are unsure of what pronoun to use, just use watashi until you become sure.
