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I had to research quite a bit but I probably still got a few bits wrong don't flame me
Hitoshi Keshihi (消日) Aizawa
消 (Keshi) – "Erase," "extinguish," "disappear."
日 (Hi) – "Sun," "day," "light."
Meaning vanishing light, as he takes hold of a person's mind with his Quirk, and causes their consciousness to vanish.
*'Keshi' taken from the kanji of Shouta’s name, 'Hi' taken from the sound at the start of Hizashi's name.
Eri Sashita (差太) Aizawa
差 (Sashi) – "Shine," "difference," "extend," or "spread."
太 (Ta) – "Great," "big," "thick," or "grand."
Meaning great power, or something of that caliber. More interpreted to mean her 'large light' (her quirk/horn) brings other people power and great aid.
*'Sashi' taken from the sound at the end of Hizashi's name and 'Ta' taken from the sound at the end of Shouta’s name.
Alhaitham unprovoked calling kaveh meri jaan and kaveh immediately buffering