Boku: masculine "I". (Keiichi uses "ore", which is informal, Rena uses her own first name (not incorrect, but not really common) while Mion uses "oji-san" ^^)
the usual "ko" is added at the end of a word to refers to a girl (or sometimes, to turn a character into female, like archerko)
in fact, it is because of hanyuu that Rika uses "Boku".
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