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The name Masami means "elegant, graceful" (雅) (masa) and "beautiful" (美) (mi). Masami's surname Iwasawa means "rock" (岩) (iwa) and "marsh" (沢) (sawa).
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Iwasawa only appeared in the first three episodes of the anime series. She was a background character in the first two episodes, but got a much more expanded role in Episode 3, the same one which saw her pass away. Her role was greatly expanded upon in both the Angel Beats Manga adaptation and the Angel Beats 1st Beat Visual Novel.
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In the anime and visual novel Iwasawa's electric guitar is a Fender Stratocaster color Sienna Sunburst, mostly likely the model American Professional with an white pickguard and maple fretboard.