Iris - Greek, fluent and Japanese (she taught the rest of what she needed to learn. When she was young her father actually snuck into her room when her mother wasn't around and taught her Greek.)

Akio - Only Japanese. Though he knows english too

Atsuko - Only Japanese.

Haru - Japanese and some english

Hana - Fluent in English and Japanese.

Kasumi - Only Japanese. Probably has the most broken accent when she tries to speak English

Jurou - Speaks both English and Japanese perfectly

Aegeus - Speaks fluent, Greek, English and Japanese. Sometimes he and Iris have random conversations in Greek when he doesn't want anyone to hear.

Kazumi - Speaks Japanese, English and French fluently

Ayumu - Only Japanese.

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Cause why not~