Answer:
也 YA, nari - is
由 YUU, YU, YUI, yoshi - reason, cause
與 YO, AI, ata(eru) - assign
尓 NI, JI, nanji, sikari, sono, nomi - you, that, only
万 MAN, BAN - ten thousand, many, all
They are the kanji on which the following katakana are based.
ヤ Katakana "Ya"
ユ Katakana "Yu"
ヨ Katakana "Yo" or The "Keigashira" radical - pig’s head
ン Katakana "N" or The "Nisui" radical - ice
マ Katakana "Ma"