Answer:
左 SA, hidari - left
之 SHI, no, kore, yu(ku) - possessive partile, also used in names
寸 SUN - unit of length
世 SEI, SE, yo - world, era
曾 SO, SOU, katsu(te), ka(tte), sunawachi - character used in names
They are the kanji on which the following hiragana are based.
さ Hiragana "Sa"
し Hiragana "Shi"
す Hiragana "Su"
せ Hiragana "Se"
そ Hiragana "So"